The Riddle King is - in Fact - a Cheap-Jack

[Sutherus]

"By morning, it walks on feet numbering four. At midday just two, no less and no more. It walks on three feet when evening arrives. And if you solve this, then I’ll know you’re alive."
- Knock-Off Riddler

Your choices for this first riddle are either "Human" or "Monster". Everyone's probably heard a variation of this riddle before. Shouldn't be too hard, right? The obvious thing would be to answer "Human" and be done with it.

Wrong. "Human" would be the correct answer if the first three sentences were followed by "What am I?", as would usually be the case. That last line, however, significantly changes the context of this riddle.

What have we learned previously or within the riddle?
- The puppets are sometimes referred to as "monsters". That might even be the case in some tooltips.
- Puppets can't lie.
- We presuppose that humans are alive, while puppets are not. Seems obvious enough, except maybe for the special boi.
- If we solve the riddle, it's proof that we're alive.
- The answer to the actual riddle would be "Human".

Now we can link all of these bits and pieces together for a better answer. If we solve the riddle, we have proven that we are alive, ergo (huehue) human. We can prove our humanity by lying, because a puppet would not be able to lie. As we know the answer to the riddle should be "Human", so we decide to lie instead and say "Monster".

All this to say: I picked "Monster" and was a little impressed with the devs when the Riddle Diddler congratulated me at first. Not bad at all, taking a riddle everyone knows and integrating it into your world-building so well.
That didn't last long, though, and I was a bit dumbfounded when he revealed that he was being sarcastic and simultaneously pulled the dad card to tell me he wasn't angry but merely disappointed in me for getting the answer wrong. Still, gave me the Trinity Key out of pity, which just makes it worse. That ♥♥♥♥♥♥'s wrong about his own riddle and tops it off with a disgusting amount of smugness. I'm now eagerly hoping we'll meet in person so I can prove to him that he is - in fact - not alive anymore.