John types in bright blue and uses perfect syntax and grammar.
Really, as far as Homestuck characters and quirks go, he's kind of boring I mean he doesn't really even use emotes or anything.

If you have a problem with this for any reason at all, I can do one of two things. I can either axe the blue when tagging your character or I can refrain from tagging your character(s) at all. You don't need to give me a reason, just let me know here! :) Comment screening is on.