fibreoptix
says:
I thought X's Bahamut looked ridiculous. In a bad way. Anima, I agree looked absolutely terrific... and Shiva on X is probably the best of all the Shivas. Diablos on VIII looked good and all the VII Bahamuts did too.
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Shiva and Diablo are also very note worthy. Very awesome designed summons as well.Shiva's design in FFX has always been a favorite of mine. Her entrance was absolutely incredible as well. This is the best pic I can find of her though I'm afraid :/
I also really liked Anima, also from FFX, and Behamaut, FFIX. As for ones I dislike, Brothers and Pandemonia from FFVIII would have to be at the top of that list. Both of them just looked strange and didn't have good entrances