Garnet.

yes, in genocide he is one of the most painful bosses out there.

It's commonly theorized that Papyrus was holding back during your fight with him, I mean. His 'totally normal attack' is one of the hardest attacks to completely dodge and his blue attack flips the games mechanics.

Sans on the other hand, is holding nothing back. He's literally doing everything in his power to break the player, not Frisk. He goes against all the standard mechanics in the game, trying to play on your expectations and doing the exact opposite. The way...

I think that Papyrus has no real will to defeat you. Even when you lose to him, he captures you and puts you in the doghouse. He's far too naive and gentle to try to do anything but capture you, and that's the meanest he can ever get