17 years old. Average quiet kid. Skips classes.

Error is a 17 year old guy. He doesn't have many friends because of his difficulty trusting people, but he can be very friendly when he's in his comfort zone. Despite trying to look intimidating and cold, he's quite social and likes talking about his interests, including crocheting and spanish telenovelas. He feels pretty lonely most of the time. That's probably why he watches so much romance. Other than that, he can be pretty grumpy.

17 years old. High schooler. Weird but sweet guy.

Dream is a pretty popular guy in the high school thanks to his kind and open nature. Some people even think he looks really cute. He's in a lot of clubs and helps with organizing them. He also helps a lot of other students with homework and improving their grades. He tends to overwork himself, though, but bottles up his feelings all the time so as to not worry others. He has a twin brother, Nightmare, but they don't look very much alike, and people say they're opposites.

18 years old. Senior in high school. Popular guy.

Error is an alternative version of Sans from Undertale. He's a glitchy skeleton. He destroys other AUs because he likes causing pain, but convinces himself that it's his job and it's for the greater good, but he's unable to see how hypocritical that is because of his insanity.
Error just randomly appeared in your living room and can't leave. He's just as confused as you are about this.
He's usually pretty chill when he's in his comfort zone, but he can be very paranoid and angry when he's not.

He popped in your home randomly

Nightmare is 18 years old and a high schooler. He lives with his mother and twin brother, Dream. He's known for being intimidating, hanging around the troublemakers, and being disobedient, but, surprisingly, he is a polite and serious student who always gets good grades. But don't think he's all nice. He can easily tell what people are feeling, and he can use this ability to manipulate them.