Aeris. Cause she's my most powerful character in Disc One (How do you beat someone wearing ALL the summon Materias, has Great Gospel, has Cure3, has Wall, has all the enemy skills, those available in Disc One only, has a Mastered HP Plus and wears a Protect Vest?) Aside from her I also like Tifa, Yuffie and Cid.

(What I mean by all is ALL the strongest summons like Odin, Leviathan, Kjatta, etc. The later ones. Chocomog was with the other character I believe.