The same concept was applied here aswell and some people didn't take it so well as you think it will. Don't "but it's only a game" here, not even simple tweaks on the mechanics won't change the outcome.
I would probably lock this because this can really cause insults even its a forum game. You won't know if the user loves his/her avatar and you'll just insult it (which is not good).
Life is like a visual novel where you have an infinite series of choices to choose from