Favorite Guardian Force

I actually like Ifrit, Shiva, Diablos and Siren's designs.

Doom train. He is my favorite summon because I could never get him in the first game I played, so there was this super huge mystery about him, then when I got him he was basically a monsterized version of phantom train that caused a myriad of bad status.

Diablos is a close second because he's just so brutal. That, and there wasn't a gravity based summon throughout the FF series before he awoken with the magical lamp, has there?

Dammit, I totally forgot where he was or whether I've even found him before. Makes me wanna play FF8 again.