Crow

Judging from what has been revealed in the story, it is assumed that Rin (known as Crow within the Yuna Band) was the one responsible for the deaths of Cuckoo's and possibly Yuna's parents. He is arrested and eventually released, but can't rejoin society normally due to being an ex-convict. Cuckoo saves him from committing suicide when following him around after his release from jail. He eventually become roommates with Cuckoo and at an unknown time joined the Yuna Band.