kaizer
A kaizer is someone who's overly dramatic and needs constant praise, like they're the only one who matters in the world.
"He's a kaizer, he cries when he gets a B.", said by someone who got a C.
"She's a kaizer, she won't stop talking about herself.", said by someone who got ignored.
"He's a kaizer, he needs a medal just for getting up.", said by someone who got dumped.