For a fun break from the main plot, I'll work out a way for ANY OC or character to join in on this crossover due to this part not being canon.
Our first crossover adventure will be with a franchise Sega already made that should be easy to fit into the logic of Mobius and other worlds too: the Night Realm from NiGHTs Into Dreams and NiGHTs Journey of Dreams
Our story will begin with a simple scenario: Cream being stuck in a bad dream and can't wake up
From there, it will be however I can make up reason for your character to get in, regardless if they're a child or not
Though to make sure you don't be delayed too much to get back to the main plot, I'll be dividing the fight sections into 4 phases.
Phase 1: Regular Nightmaren
Phase 2: Heroes vs Jackle
Phase 3: Heroes vs Reala
And finally the phase to get you back to the story.
Phase 4: Heroes vs Wizeman
Well....looks like you have your work cut out for you.
Be ready for the adventure ahead!
Scenario: (Your OC), as well as Aura and Sonic, were called over by Vanilla due to something being wrong with Cream.
The three see Cream moving about in bed as if she was having a bad dream, but when Aura tries to shake her awake...it doesn't work.
"How long has she been like this?" Sonic asks Vanilla
"She's been acting like this for two hours now. I almost called a priest to see if maybe our place is possessed or haunted." Vanilla says in worry as Cream tossed and turned in bed.
"I sense a darkness.....something is attacking her in her dreams." Aura says as he focuses on the young girl
"Wait....there's a literal world inside Cream's dreams?" Sonic says, obviously having infantile amnesia since it happened a long time ago for him
"There must be...and the threat is trying to get Cream for a reason." Aura nods as the group looks at the girl
"Well how do we get into her dreams?" Sonic asks his two friends.
(Roleplay begins here!)
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Author note
Before I forget.....here's your guest star for this crossover: NiGHTs
I'm honestly curious what kind of worlds await for each roleplayer since the land adapts to the visitor
Have fun!