My feeling is that the more obvious UFAI-alike in MoR is Quirrelmort. Consider: Inhumanly fast (newspaper reading; duel with Bahry). Inhumanly intelligent (passim). Very powerful in part because of being inhumanly fast and intelligent. Interested -- supposing him to be Voldemort, on which topic I shall say no more -- in defeating death (just the sort of thing someone might ask a superintelligent AI to find ways to do).

Speaking of which: "Tell them I ate it", says Quirrell concerning the destroyed Dementor. Dementors in MoR are a symbol of death, even if many wizards don't quite grasp that. Dumbledore doesn't, but Harry surely does. Is Quirrell really not concerned that Harry may get the message: "I am a death-eater"?