Can I ask and answer questions as someone other than myself?
This article describes that you can use any nickname to participate as long as the name abides by the rules.
You are welcome to use a nickname to participate at Yahoo Answers, as long as the name abides by the rules. Impersonation and misrepresentation are not allowed.
Participating as anything non-human is also not allowed. For example, using an avatar of a couch with a nickname of "couch" and asking questions like "Why do people like to sit on me?"