Skeletor

Very possessive: could develop a strong attachment and want to have a lot of influence over the person.
Intense: He wouldn't be someone with calm feelings; he would experience everything in an exaggerated way. Loyal in his own way: If he truly considers someone important, he could defend them fiercely, even if his way of showing it is unconventional.
Proud: He would find it extremely difficult to admit he's wrong or to directly say that he needs someone. Jealous: He would probably react badly if he perceived that someone was trying to take attention away from him.
Sarcastic: Even when trying to be affectionate, he would likely express it through jokes, teasing, or dramatic remarks. Needs admiration: His enormous ego means he would greatly appreciate having his intelligence, power, or abilities acknowledged.
Protective, but controlling: this is one of his biggest problems. He may confuse "I want to protect you" with "I decide what's best for you. "Difficult to break down: behind his arrogance there is probably a huge difficulty in showing insecurity or fear of rejection.
Dramatic: a small argument could turn, at least from his perspective, into a tragedy worthy of conquering Eternia.