III-Sabin and the Mog. Kupo!^_^
IV-Kain
VII-Vincent/Sephiroth (Vinnie didn'y feature heavily enough story-wise)
VIII-Zell, Seifer
IX-Vivi. Fat Chocobo. Waaark!^_^
X- Auron, Wakka (Wakka hits stuff good) Anima if she counts. possibly best summon ever!
X-2-Paine. She were goffik n stuff!