He has a deep fascination with birds, and will ask players to watch for rare birds in The Arc and take notes on them to bring to him. If the player manages to spot all sixteen birds, Odd Billy will reward them with Iago as a follower pet.
When speaking to Ember, she believes Billy sent the player and says she isn't interested.
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His name is a reference to English ornithologist Bill Oddie.
Odd Billy will sometimes wonder what bird watches the bird watcher. This is a reference to Roman poet Juvenal's "Quis custodiet ipsos custodes?", more commonly known as "Who watches the watchmen?"