A person who is never happy can be called a malcontent.
antagonist? maybe, not sure
If the person seems never happy and beyond the norm of mellow the term depressed seems possible Are the eyes either downcast or seemingly in a distant. discontented
Newfound is a happy word. It begins with the letter n.
happy
whoopee
yummy
Darling and delicious are happy words. They begin with D.
i don't think there is a possible word for that. but you may feel nervous,happy,your stomach starts feeling weird, etc. (:
glad
yourani ure a les
exited
A word to describe a person that starts with a letter G? gentleman or groom