>>22979483That actually gives me an idea for a similar thing.
A vaguely gremlin-like monkey that possibly evolves into a tougher mandrill. It's obsessed with tools and mechanical things, often stealing tools from humans to play around with or mess with machinery, drawing inspiration from the concept of mechanical gremlins as well as being a pun on greasemonkeys.
Would be found wild in urban and industrialized areas, although many would be trained by humans to help people like mechanics and factory workers