The Guild Master of Sabertooth.
Gemma is created by Hiro Mashima as a minor character in the Fairy Tail franchise. He has no information regarding any inspirations used to create him. He first appears in Fairy Tail volume 33: chapter 281 and episode 164. He is voiced by Eiji Miyashita.
He's a strict man who does not tolerate failure and treats his subordinates without a care for their dignity. This is demonstrated when he asks Yukino to strip her clothes in front of everyone in the guild.