Let's move on to the well known Lord of Negativity

VERY openly bisexual

Has a crush on Dream but is the master of hiding it

Actually pretty shy about a lot of things, hell, he didn't even open up about his sexuality until his team bugged him about it for a month

Killer: hey, Nightmare who's your crush
Nightmare: *stutters shyly*
Killer: NIGHTMARE, PLEASE TELL US
Nightmare: *sobbing* don't push me about this, he'll never love me anyway