Schizo

Schizo is a boss fought in Final Fantasy VII, atop Gaea's Cliff. The left head uses powerful Ice attacks, while the right head uses powerful Fire attacks. Together and can inflict a stronger Double Breath attack. It also attacks with Tremor, which hits the entire party. Both heads must be destroyed to kill Schizo. When each head dies, it unleashes a powerful group attack upon the party.

Schizo's name may be derived from the disorder schizophrenia, which is commonly (although improperly) used to describe somebody who either is bi-polar or has multiple personalities. A two-headed dragon, one breathing fire and the other breathing ice, would fit the common usage of the term perfectly.

Strategy
The best way to deal with this boss is to focus on one head at a time. Avoid using Magic Breath, as it'll heal both heads. Comet, Fire2/3 (for the Ice head), Ice2/3 (for the Fire head), as well as Bahamut are all ideal tactics to use. Having a character with Elemental-Fire as well as the Aurora Armlet, another character with Fire Ring and Elemental-Ice, and the third with a Bolt Ring (to nullify the final attack which is Lightning elemental) will go a long way in defeating this boss easily. Keep each party member's HP above 1500 to avoid the final attack, which will do roughly 1500 damage to the entire party.