Usually you would call that person a pessimist or someone who may just be miserable and down in the dumps temporarily.
A pessimist.
You could refer to them as persuasive or influential.
Someone who constantly thinks and reflects on various topics can be described as contemplative or introspective.
If someone is from Beirut you call him or her Lebanese, since Beirut is the capital of Lebanon.Actually the proper response to his query would be this:You call someone from Beirut a 'Beiruti', the same way you may call someone from New York a New Yorker etc......
Their own worst enemy. a boring spoilsport without a true friend in the world. I would call them pumpkin head. wide, round and orange with hole for a nose and mouth and eyes. All you want to do is slice their skin off, cut them up into pieces and cook them. A very tasteless activity but it would leave you in stitches.
You could call them a trigger or a source of envy.
It's hurtful to call someone names or make derogatory remarks about their character, appearance, or abilities. It's important to treat others with kindness and respect, even in moments of conflict or disagreement.
A loser
A contrarian.
Not always, no.
Sociable
a stalker
You call them a snotty jerk. They are also selfish!
germaphobe.
An Electrician
An Electrician
A Jonathan Stimson
A nudist.