Wow, interesting concept!
Could I calrify a couple of things (they're probably obvious and I'm probably stupid, but I'll choose to blame everything on it being a Monday
)?
1) Does the entry have to be a human *unique hero* (I'm thinking not, given the presence of Kato that suggests maybe a Samurai Hero or Squad might be accepted?) and
2) does it have to be someone who can activate an *existing* bonding option on one of the squad cards (or could it, for example, be a character like Kato Katsuro, who can activate other squads through a power on his own card) ?