I was surprised to see him here and after checking the game I don't think his threat is enough to make him stand out, so here's a removal proposal for him. I have permission to make this from Dual89 Proxima.
The work?
Banjo-Tooie is a Nintendo 64 game by Rare and is a sequel to Banjo-Kazooie. In this game Gruntilda the witch has been freed with the help of her sisters, and Banjo and Kazooie travel to various worlds to stop her plan of draining the life from the Isle O'Hags in order to restore her body.
Who is he?
Alph is part of a crew of aliens whose UFO crashed in Jolly Roger's Lagoon. He needs your help fixing his ship, and then appears in Hailfire Peaks where he falls to his death, and Mumbo must restore him to life and help reunite him with his missing children.
Why doesn't he count?
While he does threaten to exterminate the Earth, he gives up on the idea mere seconds later when he can't find his laser gun, saying it must be on his ship, but he then beams up to said ship with his family so he could have easily retrieved his gun and started killing people, but he doesn't even try to make good on his threat but leaves peacefully and even leaves the heroes a Jiggy as a reward for helping him. He would probably count if we saw him do more to carry out his threat, such as actually trying to kill someone (or ordering the aliens on the ship, one of whom is armed, to do it) but he changes his mind almost immediately and doesn't do anything hostile after that.
Verdict?
I say cut him.