The scene beings with the gang on what appears to be a bridge. Sora was surprised by the size and architecture of it that he was running around and looking across to the big city
Sora: cool!
Donald: c'mon, let's go!
Sora: aww, but I wanna take a look at the big city!
Arcturus: yeah! You can't just travel around without exploring the sights.
Goofy: it does seem pretty exciting.
Sora: I feel so metropolitan! Uh, cosmopolitan?
Donald: (stops walking and turns around) not-apolitan!
Goofy just chuckles and Sora pulls out his phone and starts looking through his contact list.
Sora: I gotta tell Riku what a blast this place is.
Goofy: but we just got here. We haven't even done anything yet.
Arcturus: well, (runs and returns with a bowl of ramen) noodles are pretty good.
Sora: where'd you get those?
Arcturus: a place downtown. We should get the others and comeback here.
Clara: I hate to break this moment for you guys, but we've got trouble.
To follow her claim, they heard an explosion that slightly shook them. They turn to see Heartless attacking the bridge. Everyone gets their weapons ready and they then see someone in a yellow armor get thrown back.
???: Go Go! You okay?
Sora: (turns to see something flying) what in...
They then see a robot in red and purple-blue armor fly down with a teenage boy in purple armor jump off him and checks on Go Go.
Baymax
Hiro
Hiro: (turns to Baymax) Baymax.
Baymax: (scans her) Go Go's suit has shielded her from a major injury, but the blow she sustained to her head has caused a mild concussion. We should take caution and not move her until we can fully stabilize her head.
Hiro: got it.
Sora: (excited and runs over to them) oh, cool! That's a robot!
Arcturus: an awesome looking robot! What's your name?
Baymax: (waves) hello. I am Baymax, your personal healthcare companion.
Arcturus: a medical and combat robot at the same time? Sweet!
Sora: this rules!
Goofy: uh, goys. Remember our other problem?
Donald: (deadpanned) the Heartless.
Sora: we didn't forget.
Arcturus: we wanted to see the robot. (Runs back)
Hiro: hey, who are you?
Sora: (stops running and turns to him) I'm Sora.
Arcturus: I'm Arcturus, Arc for short.
Donald: Donald.
Goofy: and I'm Goofy.
Hiro: (nods to Baymax before running up to them) name's Hiro. You mind helping us fight those things? Our team's called Big Hero 6.
Sora: (smiles) sure!
Arcturus: yeah!
Now teamed up with Baymax, he assists them in fighting the enemies. Just as he was programmed to, Baymax served as both offense and defense for the team, using he's healing spray to help replenish their health and a little MP. They spent about ten minutes fighting them before they followed Hiro back to his home where they went to the garage and met the rest of his team.
Go Go
Honey Lemon
Wasabi
Fred
Clara: (looking at a newspaper article) well, so much for being discreet.
Go Go: not cool.
Honey Lemon: people like spectacle, not truth.
Wasabi: (bitter) yeah, who needs quality reporting when you can just make stuff up?
Arcturus: that's mostly how media goes. (Thoughts) at least its not that jackass, J. Jonna Jameson. That man gives me a headache just listening to one of his rants on Spidey.
Fred: I don't get it. I mean, didn't they see how awesome we were?! Sure those things landed a couple of good hits, but we had chem-balls, and laser hands, and fire-breathing!
Honey Lemon: well, it really didn't matter. They beat us.
Go Go: where'd they come from?
Wasabi: (looks at the gang) why don't we ask the guys who actually stopped 'em?
Honey Lemon: Hiro, you never introduced us.
Hiro: oh, right. (Stands up from the chair) (gestures to his team) well, uh, this is...the gang! That's Go Go.
Go Go: hm
Hiro: he's Wasabi.
Wasabi: how ya doing?
Hiro: and that's Honey Lemon.
Honey Lemon: hello there.
He goes to introduce Fred, but he's already walking up to the crew.
Fred: I'm Fred. Don't be alarmed. (Pulls his mask back to reveal his face) this is not my real body.
Arcturus: nice to meet all of you.
Hiro: those four are Arcturus, Sora, Donald, and Goofy, the, uh...
Sora then realizes that he's referring to if they have a team name. He then notices a wallpaper of Big Hero 6. Looking at Arc, the two nod and they pose with Donald and Goofy.
Sora: Keyblade Hero 4!
Big Hero 6: (looks bewildered)
Baymax: I am detecting minute contractions in your faces and shoulders, perhaps due to the garage's brisk temperature. To remedy that, (glows orange) I will give each of you a hug and warm you with my internal heat source.
Donald: (angry at Sora) hey, why did you say that?!
Goofy: Sora, you know Donald and I don't have Keyblades.
Sora: so? Are we heroes, or aren't we?
Donald: not here, we're not.
Arcturus: too late. We have a code name, so it's official.
Go Go: the monsters. Tell us how you man to take them down.
Sora: they're called the Heartless, and they're drawn to the darkness inside people's hearts.
Fred: ooh, now we're talking! Light versus darkness. Classic conflict!
Wasabi: would you calm down, Fred? This is serious.
Honey Lemon: very serious. We don't have any way to fight them.
Go Go: wait. So we're just gonna give up?
Baymax: with our current skill set, my analysis places our chances at 0.0000—
Hiro: yup, we got it, Baymax.
Sora: hey, don't sweat it. The four of us will go take care of the Heartless for you. Right guys?
They nod in agreement and went to head out the door, but Hiro was determined to help his city.
Hiro: wait. We're going too.
Donald: it's okay. We've got it.
Hiro: (shakes his head no) we have to help. My brother would've.
The others nod in agreement, and seeing that they're not backing down, the team agreed to have them help. But, Wasabi brought up a good point that they need some help.
Fred: we train up! When heroes are brought low, they get new powers. It shugyo time!
Go Go: did you read that in Greek's Quarterly?
Hiro: Fred's actually not wrong. I may have an idea.
Hiro then gets to work and builds a couple pairs of red and black goggles for Sora and Arc.
Sora: AR device?
Hiro: yeah. Cool huh? It creates a CG overlay that augments your vision. While you wear them, these devices see everything you do and logs it.
Arcturus: oh yeah. I remember using something like this once. (Remembers his mission with Overwatch with Winston making something similar)
The two then put them on and they see a digital Heartless. Sora immediately gets his Keyblade out and the toons looked surprised.
Donald: are you okay?
Goofy: there's no Heartless here.
Sora: huh? But... Arc, don't you see it?!
Arcturus: yes, but it's not real.
Sora: what?
Hiro: whoa! Chill, Sora. Just take the AR device off.
Sora: (tests it a few times to see how it works) wow. It's like it's there, but not really there. This is cool!
Arcturus: that's Augmented Reality for you. Nice work, Hiro.
Hiro: thanks. But so far the map data covers San Fransokyo. I need to expand it.
Fred: no can we shugyo?
Wasabi: not yet, Fred. He's still learning.
Honey Lemon: Sora, Arc, all you need to do is run though some courses that Hiro scripted. Like a minigame.
Go Go: we'll put tracers on your movements so we can—
Fred: shugyo, shugyo, shugyo!
Go Go: (sighs) so we can shugyo.
Goofy: what does that mean?
Clara: it just another phrase for training to get better.
Goofy: that's a good idea. We could probably use the practice.
Donald: speak for yourself.
Baymax: I can shugyo by installing new combat data.
At nighttime, Sora was flying on Baymax and Arc was running with them to the meet up point. Sora and Arc then ran through the course that went throughout the city, using their various magic, speedster attacks, Keyblade weapon changes, and other moves until they gathered enough data to make improvements. They went back to the garage and makes the upgrades and finished up when they got a news report about Heartless attacking the city.
*DAY TIME*
They made it to the city and made their way up a few buildings, defeating heartless and rescuing people. The BB6 even got to test out their new upgrades that proved to be effective. At one point, KH4 found and were fighting a dinosaur boss that tried to get away on a building, but the team got it and knocking it down.
Sora: (takes down an enemy) nice.
Baymax: (lands and holds fist out) now we fist bump.
Sora: fist bump?
Arcturus: you learned fist bumping?
Baymax: to display excitement. Hiro taught it to me.
Sora: okay. (Fist bumps)
Baymax: (moves his fingers and raises hand) bah-la-la-la-la-la-la.
Sora: (repeats motion) bah-la-la-la-la-la-la?
Arcturus: (grins) I love this robot.
Clara: he's definitely cool. (Detects something,) wait gang, we got incoming.
A golem crashes down and everyone gets in a stance.
Goofy: get ready!
Sora: another one?!
Honey Lemon: (enters with the team) we're here!
Wasabi: ugh! Can't we pick on one our own size?
Go Go: (smirks) it looks the right size to me.
Fred: watch me scorch 'em with my freeze-nado! The only tornado made of fire and ice.
Donald: (glares) you took on the wrong court magician.
Goofy: and the wrong captain of the guard.
Sora: prepare to face Keyblade Hero 4!
Donald: oh come on...
Arcturus: (triggers Savor Form) let us have something for once, Donald.
Hiro: and the crime-fighting team of Big Hero 6! Together, we're unstoppable.
Everyone then charged towards the Heartless and hit it with everything they got. Hours later, everyone was at the top of the bridge, eating chocolate ice cream bars and watching the sunset.
Fred: (jumping around) was that awesome... (jumps next to Donald) or was that totally awesome?!
Donald: yeah, I was pretty good.
Honey Lemon: your magic is amazing. Do you think I could study it sometime?
Donald: why not?
Goofy: you just made Donald's day.
At the very top was Arc, Sora, Hiro, Go Go and Baymax.
Arcturus: hey Hiro, can I ask you something?
Hiro: sure.
Arcturus: how did you and your friends became super heroes?
Hiro: my brother wanted to help people. Now we try to do the same.
Sora: your brother?
Hiro: yeah, Tadashi. There was a fire, and now he's gone. But he always wanted to make a difference. He cared about people. That's why he worked so hard to create Baymax.
Sora: I'm sorry.
Arcturus: me too. I lost my sister when I was young.
Sora: you mentioned about her before. What happened?
Arcturus: she wanted to help people, so she joined this team to make that happen. But, one day, she left for a mission before I turned 6... and it wasn't until recently that I learned she was killed.
Sora: (looks at him solemnly) I'm sorry, Arc. I shouldn't have asked.
Arcturus: it's alright buddy.
Hiro: she's still with you, though. Just like Tadashi's still here. In Baymax. In all of us.
Sora: Tadashi—he lives on in your hearts.
Hiro: (thinks a bit) yeah. Right. He will always be a part of us in some way.
Arcturus: just like she will.
Sora: (looks up in the sky) and when you're not strong enough, they'll make up the difference.
For a brief moment, Sora wasn't there, but it was Roxas instead. The bells from the clock tower in Twilight Town was heard in the background, and on Roxas's right was Hayner, Pence and Olette, all of them eating Sea-Salt ice cream. On his left however, was instead of Arcturus, was Naminé, Axel, and Xion. Sora blinks and sees everyone back.
Hiro: Sora. You okay?
Arcturus: you zoned out for a bit.
Sora: (not wanting to worry them) yeah. Fine. (Turns back to Arc) hey Arc? What was your sister's name?
Arcturus: (looks back at the sunset) Chelsea. Her name was Chelsea.
The gang then sat in silence and just watched the sun set.
Author's note: this is my second favorite world.
I like this because rather than copy and paste, this takes place after the movie and makes it more interactable for the characters.
The mini games are pretty much the same, but Arc's version would be based off of a Sonic level.
The city invasion also plays out the same but Arc's involved.
Arc reveals to Sora about Chelsea. I plan to have him tell the others, but that won't be until after they get the Wayfinder Trio, and the Nobody Trio.
Next chapter: an old "friend" returns.