Captious or Censorious
A person who is suspicious of the motives of others can be called paranoid or mistrustful.
a snitch
a homosexual
You call the person a bully, jerk, meanie,etc
A person who does things for others may be an assistant or a helper.
A person who sacrifices themselves for others is often referred to as selfless or altruistic.
Insensitive.
My kids call me "Dad".
demophobic,androphobic
Troublemakers
The person is known as a blackleg.
benevolent person