[b]Vesuvius00[/b] Mettaton is a close third for me. Mainly cause I was so surprised after flipping his switch XD But #2 would have to be Doctor W.D.Gaster. The enigma of Undertale.
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I'm a big fan of mystery. I love a good info hunt and boy this guy takes the cake. Some people play through and never even hear about the guy. But if it wasn't for the fact paps is my ACTUAL soul animal, Gaster would be number 1.

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[quote=@Venom]
If this is for us all to answer....(The flex monster) 
[/quote]
[b]Venom[/b] Yes everyone must answer this! (Aaron the flex monster is hilarious! I have no idea how I'm going to fit him in this horror world XD How do you make a flexing Bro-horse mermaid scary?)

[b]XxLyraxX[/b] Oh you mean monster kid!
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Yeah but he's like a main character basically. A sub-main....ish. Do you like any of the common encounter monsters?