Kuprum's personality seems to be based on 4chan culture. his is furthered by Folykl mentioning his addiction to "eastern alternian pornography", a reference to hentai, which 4chan is known for as well.

He also seems to enjoy pranking highbloods, due to his dislike of them in general. Hacking into their mobile devices doesn't seem to be much hassle for him, and he was able to key in the wrong directions so that the group of blue bloods would wind up hopelessly lost in an unfamiliar part of town. While Kuprum later vehemently insists that his prank was actually a declaration of war.

Kuprum ridicules the player for being homeless and losing their lusus. He later reveals that he views everyone as idiots regardless of social standing, so that may play a part in his apathy towards the oppressed. It is also suggested that insulting the intelligence of others is what he and Folykl do all the time. 

While not an overtly pleasant person to be around with, Kuprum still cares about Folykl and to a lesser extent, the player. This is evident when the Imperial Drone begins chasing the three of them: Kuprum uses his psychic powers to levitate him and Folykl to escape, and after a bit of consideration, levitates the player as well.

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.