Typhon

Typhon, as depicted in the myth, is a horrifying monster with either a serpentine body of multiple tails, or a body of tentacles, likely a set of wings and a horrible face either demonix or skull like or sometimes as a multi-headed dragon of immense size. He's also quite evil, as he and Echidna deliberately send monsters out to trouble humans. In the series he's a giant that looks like a normal man is quite friendly especially with children, and his children with Echidna only turned evil because Echidna was distraught over Typhon's absence, which happened only because Hera had trapped him for a century. Why the change?