Gill is a single appearance character in Battle B-Daman.
Battle B-Daman
Gill may not actually be named Gill, he was nicknamed this because he was forced to dress in a fish suit and got the name from Terry McScotty. He is a resident of Luchatune and a fellow citizen alongside Castieo. While Gill was walking around town he was spotted by Yamato and the gang and told the group about how Ike had taken over Luchatune.