Kadaj
Kadaj is a dumb kid who thinks he's from the lifestream and that Cloud is his big brother. He fights with a fancy sword and tries to turn into Sephiroth to beat up Cloud.
Kadaj: 'I'm from the lifestream! I'm gonna be Sephiroth!'
Kadaj: 'Cloud is my big brother!'
Kadaj: 'I'm gonna fight Cloud with my fancy sword!'