Ok so I know we've been over the Marcel AU, but what about a more generic superhero AU? Like, what powers would you give everyone if you had free reign? For example, I think super strength could fit Jack, though that might be a little generic.
Hmm I'd rather stay generic for now, as giving detailed super-powers implies a well-defined world building hahaha
Yusei is associated with knowledge of mechanics and strategy, electricity, speed, but also stars, union, transcendence. He's the prototype of a leader, so I'd go for something that can express its true potential not only for a single user, but in a group/alliance. I don't know what it would be yet, but it would have these features.
Jack's essence is fire. Power, strength. He's instinctual but analytical (I really like the strategies he uses in duels!), indomitable but loyal. I'd stay on a simple level and go for these two main things.
Crow could fly, and it would be enough for me. He’s a responsible big bro, he earns his freedom by default. Give him all the freedom he can get. Whatever he gets more than that is a bonus.
I feel like Aki’s too easy for this game hahahaha I can’t separate her from the “nature” concept. Poison Ivy vibes. I also gave her a healing power in the Medieval AU to mirror what she gets at the end of the 5ds series (I see these two options being strongly tied anyway), so that would be amazing too.
About the twins, I’d make Ruka the one who can travel across dimensions or stuff like that. She’s very “spiritual”, her connections feel like a superpower of their own. She would never be on the frontline, but she’s an excellent support though. She also represents the greatest motivational element for Rua, I’d rather see HIM on the frontline and surprise everyone with some newfound power, stuff like that. He kinda makes me think of (Marvel) Spiderman, the kid everybody perceives as too young and inexperienced for the battlefield, but who actually has an unimaginable potential and represents an important element for the success of the team. About his superpower, I wouldn’t really know, I’d kinda go back to what I said about Yusei, there are common elements between them.