- Steve, Bob, Joe, Bulby, and Billy were the only characters Chugga named himself, besides his Pokémon.
- Chugga said "The Characters I name become viral like.... Him" ("Him" is Steve).
- Billy was the 5th character that Chugga named besides Pokémon.
- He was first seen is Chapter 2 of Super Paper Mario.
- Billy is the first character Chuggaaconroy named that isn't a Pikmin or a Pokémon.
- He is also the first character species Chugga named that isn't a human, or based off a human besides Pokémon.
In episode 51, Billy returns, and Chugga buys him from Flimm.
Billy came with Chugga into the Pit of 100 Trials and came out to face off the Wrackles on Wracktail when Chugga was attacking the antenna.
He then disappeared a few seconds before Wracktail met his demise.