Art in Five Nights at Wario's - Community (Official)
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The Wraith, from the fangame Cabin Fever 2: The End.
Suggested by @TongKui 
Drawing of Wario from Five Nights at Wario's 2.
Mario, from the fangame Six Nights at Wario's Left Behind
Suggested by @FNAW_Anything 
Computer Virus Luigi, from the fangame Six Nights at Wario's Left Behind
Suggested by @Whaaaman 
(I'm going to be honest I don't feel like I gave him enough justice because I'm bad at adding effects. :( )
Hardmode Mario, from the fangame FNaW: The Remix.
Suggested by @Carble 
Mutated Bowser, from the fangame Wario Land.
Suggested by @Mariostroke111 
Disjointed Yoshi, from the fangame FNaW Cabin Fever.
Suggested by @Radical_Nerd24 
Have a Wario from FNAW in Super Mario's Misery teaser :D
Nightmare Waluigi, from the fangame Those Nights at Wario's: Cursed Factory.
Suggested by @Heisenbergus 
Even though he ain't a FNaW character, here's Fake Peppino from Pizza Tower. Suggested by @Lugigdew4 
(he asked me to draw him months ago so I'm now returning the favor).