Tyranid Hormagaunt
Vast quantities of Hormagaunts throw themselves into the meatgrinder for the will of the Tyranid hivemind. Though smaller than a human, their claws can nearly rip a Guardsman in two or even pierce Space Marine armor.
Perfect Warhammer 40k scifi bug to send by the million. The animations are limited currently so it’s more like a zombie cosplaying as a Tyranid until more tools are available.