Monster In My Pocket was a very successful line of soft Keshi-style soft plastic figures, first released in 1990. A hugely popular line - thanks to their cool designs, relatively high production quality (for a toy of their scale) and allowance-friendly price-point - the early Monsters came from a variety of mythological sources.
But by the mid-Nineties, the (then) WWF's rising popularity saw a savvy shift in focus from the Monster In My Pocket line with the introduction of the Monster Wrestler In My Pocket series.