ラブ

Rabu is a yellow budgeriger with a Kansai accent. He is a regular customer of Torimi cafe, which is owned by Kenzaburou. His manner of speech is similar to that of a gangster, which is an oddity in the classy Torimi Cafe. Currently he works as a chauffeur and goes to Torimi to relax before his shifts. He is said to be a very careful and reliable driver. He is part of a sidestory that is available during summer.

NOTE: Rabu only appears in the full version.

Taken from his Hatoful Boyfriend Wikia entry.