A recluse.
A person who likes to hurt others is called a sadist.A masochist is a person who enjoys hurting themselves
A lover.. :) Or, they can be needy?
You call a person who likes animals animal advocate, animal lover, etc.
a person who likes word games
Hypochondriac
GEEK
Abusive
a panhandler!!!!
There is no special name for a person who likes squirrels.
a very intelligent person.
Human.
Hermit