Hint-man

If you are a Github user, I guess Hint-man will be helpful for you with its features.

Hintman is a GitHub application that automatically submits reviews to opened pull requests in your repositories with inline hints. It heavily makes the use of the GitHub suggestions feature, so that all the hints could be applied in one click.

Hintman was inspired by the series of Hitman video games. Hintman's replies are based on the quotes from the game. Of course the avatar is the hint.