You can call a person who loves mechanical objects a mechanic. You can even call them Machinist, inventor or even an engineer depending on what type of mechanical devices they working on.
You call a person who likes animals animal advocate, animal lover, etc.
a person who likes word games
GEEK
a panhandler!!!!
Hypochondriac
Abusive
There is no special name for a person who likes squirrels.
a very intelligent person.
Hermit
A snuggler
A recluse.
A sybarite.