The Red Viper says: Renown. Immune to events and character abilities.
The Red Viper does not kneel to attack an opponent who controls more characters than you.

Question: Is deadly a character ability? I didn't see anything in the rule book that stated it was. I assume that it is but you know what they say about assuming…

According to the FAQ:

(3.7) Card Abilities
"Card abilities" (i.e. "Character ability," "Location ability," or "Attachment ability") refers to anything in a card's text box, except for traits, keywords, and flavor text. "Card abilities" also refers to any abilities (again, keywords and traits are excluded) gained by card effects.

So, since "Deadly" is a keyword, it is not a character ability. TRV can be killed by Deadly, just like he can be bypassed by Stealth.

Awesome, thanks for the prompt reply