Hmm, since you swept KO’s set of DC trivia…
IQ1: Is your homeworld extremely hot, which relates to your superpowers?
IQ2: Did you (mostly) quit a superhero team upon your accession to the throne of your homeland?
IQ3: Do you wield an axe that can cut through anything? Anything?
AS you said, Professor Pepperwinkle
As you said, Professor Plum
PC Plum
DQ: Does your last name begin with P?
The gauntlet has been thrown. I am determined to stump you on a comic book question.
IQ1: Are you a supervillain who can duplicate super powers who determined that 3/4 of the human race was inferior and needed to be eliminated?
IQ2: In a crossover with Marvel, did you team with Dr. Doom to take on Superman and Spider-man?
IQ3: Were you originally a crook named Eel O’Brien before you developed super powers and decided to fight crime?
Since that’s not Sun Boy, take a DQ for #1.
2. I’m not Princess Projectra.
3. I’m not the Persuader from the Fatal Five.
#1. I’m not Prof. Ivo, creator of Amazo.
#2. I’m not the Parasite. (Not the best comic team-up ever, BTW IMHO)
#3. Eel’s first name is actually Patrick. I’m not Plastic Man.
DQs:
IQ1) Did you get ***A Confederacy of Dunces ***published after John Kennedy Toole’s mother showed it to you?
IQ2) Have you won six championships since firing Bob Hill and taking his job yourself?
IQ3) Do you drive the Compact Pussycat?
Take DQs for 1 and 2.
I’m not Penelope Pitstop.
Walker Percy got*** Confederacy of Dunces ***published.
Team GM Gregg Poppovich fired Bob Hill and took over as coach of the San Antonio Spurs, who have won 6 NBA titles since then.
DQ1) Alive?
DQ2) American?
DQs:
Previous IQs:
Did you seduce Igraine? - Yes, Uther Pendragon.
Were you First Speaker of the Second Foundation? - Preem Palver.
Were the trainer of ancient Greek heroes in the Disney movie Hercules? - Yes, Philoctetes (“Phil”), memorably voiced by Danny DeVito.
DQ:
Born since 1900?
IQs:
Were you a spy whose cover was blown by a top State Department official?
Did you reveal that Ronald Reagan was a real go-getter control freak behind the scenes?
Did you once briefly play a stabby Father Christmas?
Correct on all three.
IQ1: Were you born Thelma Ryan?
IQ2: Were you the Confederate commander during the attack on Fort Sumter?
IQ3: Did you design and build a new passenger vehicle in the 19th century?
IQ1) Did you play the drums for the jazz fusion band Brand X?
IQ2) DId you win and lose your title to Ingemar Johannson?
IQ3) Are you Michael J Fox’s brother-in-law and a successful author?
Sun Boy was from Earth, of course. It was Polar Boy, whose people used their cold powers to manage to live in very hot conditions.
If they had awards for most mismatched codename and power set, I think the Persuader would be in the running.
DQ: Are you known for the arts, performing or creative?
IQ1: Were you hired by DC comics to write a letter column while you were still a teenager?
IQ2: Are you from the planet Braal?
IQ3: Did you design a new kinds of guitars?
DQs:
(I had thought of using John Payne again, but decided better of it.)
I actually had in mind Paragon for #1. According to Ivo’s wiki, Ivo didn’t actually duplicate super powers. He stole them and imbued his android Amazo with them. There’s no indication he thought the human race was inferior, as far as I can tell. He just didn’t like being among them. So, I’m calling it a DQ, but I’m not finished with testing your DC knowledge yet. 
DQ: Known for military or war achievement?
IQ1: Are you one of the Metal Men, nicknamed “Tina”?
IQ2: Are you a jaded, street-wise, cigarette-smoking janitor who works for Dream?
IQ3: Are you an eyeless enemy of Green Lantern and Green Arrow, who tries to destroy atomic power plants?
Take 3 DQs.