Some TMNT stuff really isn't for little kids.
Gothano is a member of the Pantheon, an immortal family of beings that have influenced human affairs for eons. Gothano's domains are secrets and hidden knowledge, and he seems to dwell deep under the ocean.
He is the least human-like of all his siblings, not even being anthropomorphic in shape. Rather, he is a cloak-like mass of hair and tentacles. He also speaks the least and most quietly of all his siblings, but his words are given great import as a result.
Gothano attended the Pantheon's centennial gathering at the Den of Delights.