As far as I'm aware, this is who needs a nemesis:
[list]
[*] Villains
	[list]
	[*]Mimic
	[/list]
[*] Heroes
	[list]
	[*]Cornillous Fegular
	[/list]
[/list]
And, The people to my knowledge who currently have nemesis are: 
[list]
[*]portal (Timemaster) - The Host (Blackpanther)
[*]THE Infamous (Infamous Empath) - Dreamscape (Fantasy Kitten)
[*]Ignis (Kabensaal) - The Kineticist (Generalknox) (unofficial)
[*]Therma (Lost Destiny) - THE Red Demon (Dabombjk)
[*]Vantablack (SilentSniper211) - Quinton AfroSamurai()
[/list]

[@Kangutso]