This person may often be referred to as a Saloonabomber.
Though, many people prefer to refer to this person as "Mentally unstable" or maybe, "A COMPLETE LUNATIC!!!!".
I hope this helps.
Saloonabomber
A blower upper
You call a person who likes animals animal advocate, animal lover, etc.
a person who likes word games
a panhandler!!!!
Hypochondriac
Abusive
GEEK
There is no special name for a person who likes squirrels.
a very intelligent person.
Hermit
They would be an extrovert.