In battle a character can get KO'ed, Knocked out, not killed. As for aeris, if your good at a rpg then you would know how to use her. Have her cast magic! Her limit breaks were one of a kind and shouldn't be tossed away as they suck. Using seal on bosses can reallly help if you don't level up and if you get level 2 then fury brand is the "cough". Level 3 is just heal and invinsible but level 4 will make any monster a wimp.