All the new Espers, some I'm pleased with and some they're just "meh".
Titles are links to their respective videos.
UltimaI like Ultima a lot, I believe most people who've seen the video do as well. I look at Bahamut being similar to Flare and Leviathan being similar to Holy. Both are pretty equal in damage and both are opposites. I believe "Ultima" is the balance and stronger between the two so that's why I implemented Ultima as a summon as well.
While I used the Ultima sprite from FFT:A, this is the actual "Ultima, the High Seraph" summon:
http://finalfantasy.wikia.com/wiki/Ultima_%28Summon%29SyldraI don't like the Syldra one that much to be honest, I feel as if I didn't do anything except replace the Tritoch sprite. (Which I did).
There are some blue lightning bolts from some cinematic scenes I'll most likely be replacing with. No more Tritoch animations, even though it's pretty similar(close) to FFV's Syldra.
LeviathanI like Leviathan kinda, I hope you guys feel I did him justice giving him a "FFIVish" feel. I wanted the "Water Edge" graphics because of how the animation seems similar to FFIV's Leviathan tsunami animation.
I can always change the water animations (Water Edge) to Wave although I don't want to mimic Bismark. Bismark won't be in my hack, he's being replaced by Leviathan.
TitanI like Titan the most because his feels the most "custom" out of all the Espers I've implemented. It's not just a sprite replacement like Syldra and Ultima are. I replaced Terrato for Titan, although I didn't use any of Terrato's animations except maybe the Esper coming out of the ground. I used "Quake" as the Esper attack animation.