Arnyx

Ranked as XVIII in Organization XIII. He has power over sound waves and is capable of distorting how noises sound to people, including volume.

Origin
Arnyx was found by Mandroxa at Punrow Junior High. His powers of sound are a contrast to Zexion's powers of Illusion.

Key Plot points
Arnyx was inducted into the Organization after Xemnas's defeat, so he was never influenced by any original members. Once Elex becomes a part of the Organization, Arnyx often fights for the attention of Mandroxa.