Microbe, you have to change them to the next form. Level them to 11 and then use an Emerald to turn them into "Weaponname II Level 1" to unlock the Charge ability for that character when equipped.
Everything maxed. Wave complete = 113. Only took a few hours.
Don't listen to the people saying stuff is too expensive at high levels. It still only takes about 5 minutes to get each upgrade, and the final tier of the abilities are all free, to boot.
Good game, though.
If anybody is looking for a flat even bonus to stats from the questions, pick the top answer every time except for question #8, where you should pick the middle answer. This gets you +4 to all 5 stats.
 "Crystal Story II"){kind=icon}
 "Crystal Story"){kind=icon}
 "The Peacekeeper"){kind=icon}
 "RPG Shooter: Starwish"){kind=icon}
 "Epic Battle Fantasy 3"){kind=icon}