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Hot n cold
Originally I didn't have much of an idea for Tea or Tristan in the AU which is why I didn't write about them. I really love Tea though and it would be wrong to seperate their friend group more than I have, so Tristan can come along for the ride!
Tea: One of Yugi's only friends, she didn't sign up for a multi-dimensional war but by god she's going to support her friends with pep talks (and maybe some dueling) all the way. Honestly I would love to see the interactions she has with the non DM characters. She is definitely adopting like half the cast. I feel like she'd also enjoy the concept of action duels and duletaining a lot, so I'll definitely give her at least one (probably more) important duel(s). I think she'd be playing a dark magician girl deck or maybe a different spellcaster or fairy deck.
Tristan: He's definitely going to be friends with Joey and start off as a bit of a delinquent like the orgional manga but grow to become a better friend for the rest of the DM gang. He's absolutely going to throw hands with the obelisk force at one point or another. For a deck I think I'd maybe give him a warrior deck of some sort if he ever duels.
I'm going to expand on my previous post and go over the characters series by series starting with DM! (Just note a lot of these ideas are fluid.)
Yugi: Yugi is going to be very similar to how he was in the early manga and season 0. He goes to a normal highschool and than an after-school duel school (yushow?) In the standard dimension. He carries the box of the millennium puzzle in his backpack as he never finished it because Joey threw the last piece away. Because of this Yugi (provided he doesn't go to yushow) has no real friends and lacks a lot of confidence in himself. He'd probably play an updated Silent Magician & Swordsman Deck.
Joey: Joey is also going to have similar Characterization to the early manga and season 0. He lives in the standard dimension going to the same school as Yugi and doesn't duel. He's just generally a delinquent. (He will get better and eventually become a good friend similar to DM). He'll eventually play some sort of deck involving Red Eyes Black Dragon.
Seto Kaiba: Of all the DM characters I'm definitely including, Kaiba is going to have the most differences from his cannon versions. I have two different ideas for him. Option 1 - He doesn't get adopted (Gozoburo & Kaiba corps by extension don't exsist) and has to do his best taking care of himself and mokuba making a living by doing odd tech jobs and dueling. Here he would probably use a Blue Eyes Synchro deck. Option 2 - He got adopted by the Akaba family and went with Leo to the fusion dimension to create Duel Academy. Here he would use a Blue Eyes Fusion deck.
Bakura: I'm not sure if I'm putting Bakura in but if I do, he'd probably be pretty similar to how he was in DM but without the millennium ring and being Yugi's friend. Or he'd have the millennium ring and be one of the few people who knows what's going on, acting like the cryptid he is.