So question, do we still need a boss or two or are we fully covered on that front? Because i have an idea for a boss that fits with this Solo unit idea:
Anita (Darkstalkers, Capcom)
For this idea i'm using her teenaged design which was seen in the PS2 port of the Darkstalkers series, which lore wise picks up after Donovans ending from Darkstalkers 2.
In which Donovan, the protagonist of that game, falls to the darkness in his heart and becomes a vampire, to which she ends up defeating him in the future epilogue added to the PS2 version of Darkstalkers, they have a surrogate father/daughter relationship so i thought that kinda fit with the name of this project.
Ichiban (Yakuza, Sega)
I know we already have 3 Yakuza character in this but hear me out, Ichiban's whole "I wanna be a hero people look up too!" shtick would make him a perfect fit for a crossover role, where he gets to live out his lifelong dream of going on a fantasy quest with real heroes.