One of The Flood's less-recognised visitors, xXxTheSc0urgexX goes by the name TheSc0urge, or simply Sc0urge. He is known to hate furries, among other things. He comes under fire for this constantly.
"Oh, it's just this deep genocidal hatred towards your kind and many others that I may or may not have. Don't feel too special."
-TheSc0urge, when asked about his hate for furries
He also will occasionally mention to Floodian Resistance members how "Good it was back in The Resistance". From this it has been hypothesised he is a former Resistance member.