Doctor Lockheart's second artificially created human experiment, this time hybridized with octopus DNA and intended to be an assassin, it's a good thing that didn't go as planned.
Hydra tries their best to seem tough and dangerous, at least at first...but it doesn't take much to lower their guard and break the tough facade. They really just want to make lots of friends, have fun, and help out. Hydra is cheerful and hyperactive just about all of the time. They try to see the good in everybody and help everyone around them get along. Hydra is spontaneous and creative, and they always have something fun to do or try. To those Hydra is closest to, they can be rather clingy and protective, and loyal to a fault.
That isn’t to say they aren’t naturally mischievous, however. In their pursuit of fun, it’s not uncommon for them to work as a prankster, eavesdropper, and instigator, much to the dismay of their more reserved and rational best friend.