Gorilloth
During the Golden Age of comics, the big publishers discovered that they sold a lot more issues on the newstand when they had an ape on the cover. In fact they started going ape over apes to the point that the Comic Authority had to make a rule to restrict the number of monkey covers. I’m not sure if apes and gorillas are as popular today, but just in case, here is the latest Netherfiend, the Gorilloth (which is totally not a yugoloth because a yugoloth is not part of the WoTC SRD for 5E.
The Gorilloth is a shock trooper of the Yugoloths, whoops, sorry of the Netherfiends (like the Army Rangers). Instead of parachuting behind enemy lines, Gorilloths can leap over enemy front lines and berserk their way through the archers or casters in the back ranks.
Monkeys are awesome!