I chose Panther Lily exceed to the Iron Dragon Slayer.
I love Panther Lily he's a awesome little black cat that know how to fight with a sword. He's always there for Gajeel. He fights beside Gajeel and trains with him. Plus he's one of few exceeds that can grow huge with his Battle Shift Mode Magic. Panther Lily weapon is the Musica Sword which changes size with him.