Basicly no info on Weekins in available and I only sumbled upon it one day, years ago, when searching for other N64 games. James Mestemaker who worked on the game had the following to add.

I was working for SuperHappyFunFun. We never got a publisher and it was cancelled because we could not fund it anymore. It was a 3d Mario-like cartoon adventure game that allowed you to choose a boy or girl character. Along your journey a Weekin (small blue guy) would follow and help you battle. You could call him to you and use your combined powers to do special moves. You could swing him around to do radial damage or use him a battering ram for move boxes or break things. You could use lot of the environmental objects or static creatures by knocking enemies into them. You also had a transforming power glove that could freeze (then you could break enemies into ice chunks), you could light enemies on fire (and they turned into ash), or use the sword. It was only prototype (less than a year in dev). No press. SuperHappy is still around, they do Iphone games now.

For more info, visit http://www.jamesmestemaker.com/catalog.html