Kuprum's personality seems to be based on 4chan culture, most likely the "politically incorrect" board, as he seems to favor the empire and Trizza, even being thrilled at the thought of what happens to powerful psychics. This is furthered by Folykl mentioning his addiction to eastern alternian pornography, a reference to hentai which 4chan is stereotyped for. His typing quirk reflects this, as putting greater-than signs in front of messages ("greentexting" as it makes the text green) is used on the site for multiple purposes, including quoting another user's comment, or telling a story. 

As a lowblood, Kuprum is not obligated to speak in a formal manner, so his speech is casual and peppered with swear words. He also insults the player (and probably everyone else) quite frequently, using just about anything as cannon fodder for taunts and mockery.