Alot of Japanese games have FF crossovers in their games. They even made a FF fighting game with Namco and Capcom in Japan. A few US games/converted games have FF things in them too. Like SMRPG. Culex is rumored to be from FF2.
Culex isn't really from any FF game, but the reference is in the crystals, and his theme is the FFIV boss theme. (And, that the Victory Fanfare plays when you beat him. ) Although, I always thought he was Garland when I was a little kid.
Yeah, and Peach desperately healing the party, while I try attacking only to die again. Fond memories of that.
Ahh.....killing those Wind and Fire Crystals with a chain chomp. @.@ lol, speaking of crossovers, a certain gameshark code in Kingdom Hearts lets you summon Bahamut. But it freezes the moment you do. <.< At least, that's what Joel stated from the Gamefaqs message boards.
lol, they made YuRiPa into little tiny fairies. Which isn't all that bad really, since they're vital to the level 99 in 20 minutes trick. So, yes. They're awesome.
On final fantasy 10 there is a summon called yojimbo.
On final fantasy 5 there is a monster called yojimbo (looks like a undead ninja) which roams around dimension castles courtyards (the area before you go to fight x death for final time).