Error is canon.He has haphephobia,the fear of being touched.If he's touched by someone,he starts glitching and literally turns off for god knows how long.Also,he never smiles and his voice is glitchy.Nobody knows his birthday and doesn't care.

Blue would go hang out with him rarely even if Dream warns him.

Ink just likes annoying him sometimes.

The bad Sanses rarely go to Error.But if they go,then for stupid ass reasons.

Right now,Error is alone in his white huge void. (You're Error.)