Note: I'm not doing the recommended characters. If something doesn't say it's a recommended character I'm gonna assume they appear in multiple episodes. Also doing the rival characters.
Badgey
Metallic/Alloy/Fans
Yellow/Yellow/Lemon
Earth Unusual eyes
Badgey is Shieldy's Rival, he failed to do 5 balls into the basket. He is a contestant on the fake show called Battle of the Objects and is colored gold.
Baguette
Basic/Stripes/Wraith
Ginger/Ginger/Ginger
Earth Uncommon eyes
Baguette is a male contestant on Brawl of the Objects and was placed on Team Chocolate. He speaks both English and French (revealed in Episode 12, Rookie Mistakes), so every time he speaks French, subtitles appear at the bottom of the screen. However, he can speak English, as revealed in Episode 12, Rookie Mistakes, and he only uses French stereotype to make everyone thinks that he's French.
Personality
Baguette is a bit of a loner, he doesn't get along very well with the others. However, this is because of a major lingual barrier. Baguette can speak French and English, and relies on Subtitle to translate his words for him (only if he talks in French). Despite this, he has made a few friends, especially in Boat, who is the only person who's attempted to learn French. Said above, it was all revealed that he actually uses French stereotypes to trick everyone into believing that he can only speak French and admitted that before he got eliminated, he is rarely nice to contestants and he is usually mean, frequently insulting and always even harming and punching other contestants, he is the 3rd meaniest contestant due to it.
Big Orange Chicken
(According to the Wiki he was voted in for more than one episode, he counts)
Basic/Basic/Runes
Orange/Orange/Red
Earth Goat eyes
Big Orange Chicken is a recommended character who debuted in Go, Battle Monster! He entered the game with 52 votes in A Treasured Welcome and was placed on Team Chocolate. 2 episodes after debuting, he was eliminated with 146 votes.
Personality
Debuting six episodes in the game, no one quite knows what goes on in that big orange head of his. Despite being the only contestant who isn't an object, he still manages to make a few friends during his short time in the game, when he's not laying eggs that is.
Boat
Basic/Basic/Ghost
Ginger/White/Ginger
Water Common eyes
Boat is a female contestant on Brawl of the Objects and was placed on Team Chocolate.
Personality
Boat is quiet and may be soft-spoken, and may not have the highest social skills, but she tries her best to be friends with the others, even learning some French in order to connect with Baguette. Her body can be used for traveling on the water, carrying her teammates or sliding down a snowy hill. Overall, Boat's quiet voice is undermined by her big heart.
Boom Box
Basic/Basic/Scales
Chocolate/Brown/Yellow
Lightning Rare eyes
Boombox is a male contestant on Brawl of the Objects.
Personality
Anko6's description:
Boombox came in 12th place overall in BOTO. While he’s a quieter fellow, he’s a loyal friend, and enjoys expressing himself through the music he plays. Likes music, dislikes being judged for his size.
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Boombox is a big guy with a big heart. The best friend of Party Hat, he's generally nice to everyone, making him an easy guy to be friends with. However, his big size and deep voice make him an off-putting player, but he still tries his hardest.
Chocolatey
Basic/Basic/Runes
Chocolate/Chocolate/Chocolate
Earth Common eyes
Chocolatey is a female contestant that competes on Brawl Of The Objects. She is best friend to Popsicley and Team Captain of Team Chocolate after Pizza's elimination.
Personality
Chocolately is Popsicley's best friend. She's a fun loving girl who has a major sugar addiction. She loves candy and sweets and often gets herself into sugar rushes easily. Despite this, Chocolately is one of the more lax contestants, often letting things go as they may, as opposed to her strategic friend Popsicley.
Coffee
Basic/Basic/Capsule
White/White/Auburn
Earth Uncommon eyes
Coffee is Chocolatey's Rival, She is super hyper and won due to Chocolatey getting stuffed.
Controller
Basic/Basic/Peacock
White/White/Blue
Lightning Common eyes
Controller is Controlly's Rival and the main antagonist of the episode Meet Your Match. He hosted Battle of the Objects, before it got cancelled due to being a rip-off of Brawl of the Objects.
Controlly
Basic/Basic/Peacock
Gloom/Gloom/Radioactive
Lightning Uncommon eyes
Controlly is the host of Brawl of the Objects. He is also the equivalent of Controller in the fake show of Battle of the Objects.
Diamond
Crystal/Facet/Opal
Cyan/Cyan/Splash
Earth Rare eyes
Diamond, also known as Princess Diamond, is a female recurring character in Brawl of the objects.
Coverage
Diamond is first seen in B.O.T.O. The Videogame, specifically in the video game. When Shieldy successfully defeats the hacker, Diamond is saved, and she thanks him. She then says she'd kiss him, but her husband is waiting in another castle.
Her next appearance is in If You Can't Take The Heat, sitting with Chocolatey in the epilogue. Chocolatey, after having used a fake recipe, says she can't believe how unreliable some people could be, then Princess Diamond asks her to tell her about it.
Diamond's final role is in How It All Ended, where she is first seen voting for Shieldy in the social challenge. Later on, when Emerald finds her on the bleachers, she tells him that he spent 25 years trying to search for her in obscure, incorrect places. She explains that there was a note instructing him to climb out of a castle, but since he didn't do that, she got out of the castle and remarried to a dragon. She then flies away on the dragon, leaving Emerald shocked and hurt.
Diamond is mentioned various times throughout the series. In A Treasured Welcome, Emerald shows up in the treasure chest that Team Vanilla opens up, asking if any of them has seen her. A similar thing happens in If You Can't Take The Heat when Emerald shows up out of the ingredients pile, in front of Chocolatey, asking if she's seen her. In How It All Ended, Emerald asks the same thing to Shieldy.
Bonus Hatchlings