A person who is constantly grumpy, or occasionally suffering from a very high level of grumpiness.

A grumpustiltskin, is a term used for a major grumpus.

(No link whatsoever to Rumpelstiltskin)

Someone who is possessed by clout chasing. The original human is now gone and a demonic entity that feeds on clout is all that is left. An empty shell with no control of their actions, forced to blindly react to situations they think will bring them attention.