Distemper

Distemper is a custodian who works at Ponyville Hospital, possibly now undergoing Nursing school. An aged unicorn, Distemper is loyal, but grouchy and often appears scary or immoral to those who don't know him, but is actually a kind and gentle soul.

Personality
Distemper is a grumpy individual who firmly believes that ponies should mind their own business and not interfere. Otherwise, he's a gentle and caring soul whose deeply loyal to his job and has shown to be more intelligent than he lets on.