It took an awfully long time to guess Professor Quirrel (more than 30 Q's)
Edit: Holy shit, it guessed Yahtzee right!
Edit 2: HAHA! This thing is amazing! Marona from Phantom Brave in 30 Q's

!
Edit 3: HAHA! Guillo from BKO in 30 Q's

!
Edit 4: Guessed Black Hat Guy from xkcd correctly

!
Edit 5: Guessed Kirby correctly

!
Edit 6: took a while to figure out prinny :|
Edit 7: HOLY SHIT. It got Commander Gore from Shin Megami Tensei: Strange journey right in slightly over 20 Q's!
Edit 8: guessed linebeck correctly (expected it to)
Edit 9: Guessed Geo Stellar correctly
Edit 10: guessed sun wu kong correctly! (Magic Monkey)
Edit 11: Guessed Joshua from TWEWY Correctly

!
Edit 12: Thought I defeated it with Luminoth (MP2:E) but found U-mos in it's list so it dosen't count

aww so close.
Edit 13: Let it get off on not knowing Ing (It knew emperor ing).
Edit 14: Finally Defeated it. Added Lyra (Megaman Star Force) to it's knowledge. And with that I am done