The lemon isn't having fun but is sarcastically saying he is

A zombie John Watson

Superman dropped his hot cocoa

Its a kitty type thing

A zombie Sherlock Holmes

Its a zombie pirate

Its a waffle looking at porn

Jesus riding a rhino

Its a monster type thing carrying a letter

I think its Sam from Supernatural on the episode where he lost his shoe after losing a lucky charm and is now yelling insults at a bush...

Aww how cute

Its an elf