Smogmella has hair that is a baby teal color, and wears a cloud-like dress, which is light grey.
Smogmella is a female Yo-kai made out of smoke. She has long flowing sky blue hair and white robes, pale skin, a ghostly tail, and big soulful sky blue eyes.
Smogmella is able to construct a large, blinding fog.
In Yo-kai Watch 2 in the past, while the player looks for a missing part to the Yo-kai Watch Model Zero, Smogmella gets inspirited by Schemer and turns into Badsmella. She causes trouble by inspiriting construction workers with her smoke. At Springdale Ironworks, she reveals herself and makes the player find her. On the final time, she battles the player. When defeated, Schemer stops inspiriting her and is defeated by either Arachnus or Toadal Dude (depending on the version). Arachnus/Toadal Dude tells Smogmella to come with them, and she apologizes to the player and goes away.
Her English name, "Smogmella", is a portmanteau of smog and Armella.
Her Spanish name, "Nebula" is a shortening of "Nebulosa" (Nebula).
Smogmella is based on the youkai Enraenra, also called enenra (煙々羅, "lightweight-fabric smoke"), the name describing how it flows and drifts through the air like sheer silk or cloth. When the smoke rising from a bonfire or a stove doesn't dissipate for a while and strange shapes can be seen within the swirling fumes, that is a sign of the enraenra's presence. It is fundamentally a harmless creature, and some believe that only the pure of heart can see this youkai.
Smogmella's "random" nicknames in Yo-kai Watch 2 are: Ms. T, Smoglina, Mistella, and Eleanora.
During her Soultimate move, Upward Tornado, Whisper can be seen for a split second.