I took the time to cycle through all the characters to keep them at a similar level and to unlock all their moves, aschen is good, not as high damage as kos-mos, but she is a great survivor and very hard to take down.
I use aschen. She's actually quite a good damage dealer, but a bit tricky to juggle with sometimes. Nowhere near the headaches you can get from juggling with suzuka though. You'd think that Jyaki-gun could send them flying better.
Just have a question, after finishing the game is there anything to do? like after beating the final boss and after seeing the credits?