[kupoartist]

hmmm...
FF4: Bahamut (most powerful... and umm, SNES graphics don't really have much between "looks great" and "looks ugly")
FF5: Golem. Not many summons keep turning up, whacking you one and leaving, only to get attacked themselves and ask for your help. Plus it was pretty useful.
FF6: There were loads... Phoenix was quite good in this one, as there was a fair bit of story to it.
FF7: Choco Mog! Shame it stank, but it looked good
FF8: Doink! its the Tonberry. (I liked the Cactuar as well...)
FF9: Odin was back on form...
FF10: They were all a bit boring really... Bahamut was pretty good.
FFTactics: Kupo! Around and around you go! Moogle!

Brit, you should really try the earlier FF games. They're quite fun, if somewhat Graphically... retarded. At least try FF6 and then FF Anthology (FF Origins is a little hard to get into). They all have stories that are nearly as good or better than those you've already played, and the characters are great as well. Plus, they're dirt cheap in the UK (FF6 - £10, FFA - £20, FFO - £20 - all cheaper if you shop around.)