These characters deserve more than just a browser game! Why couldn't they be playable in a console game that can be played offline?
They have awesome designs (both Part 1 & Part 2), plenty of costumes, tons of neat moves, lots of background info (likes, dislikes, hobbies, person they want to fight, even Blood Types!).... Hell, they're more developed than the majority of filler characters and even some of the more minor canon characters.
Why do they have to be confined to a browser game? Now i'm sad.....