Aviella (also known as Avi_ella or just Avi for short) is a major character in ROBLOX NPCs are becoming smart, as well as a Roblox YouTuber. On her channel, she mainly posts ending tutorials of RNABS, as well as other RNABS related content such as shorts, following the fanmade adventures of the RNABS cast.

She was later officially added to the game by Groovy in order to replace GamingKittyCath. Because of this, she sits in Cath's place at the bus stop. Talking to her will activate her subending