Zoey

Marie

Ignacio

Galen

Ollie

Tala

Quinn

Bodie

Teacher

British

Vampire Bodyguard

Francis

Woman

Bodyguard

The Narrator

African lady

Soft Bubbly

Southern

Robot

Hailey

French

Hood

Indian Girl Accent

A French Girl

Male Russian Accent

Irish

Blue Spongy is a recommended character who was recommended by simondomino in "Bowling, Now With Explosions!" It is a blue version of Spongy who had already appeared in the April Fools puppet show at the beginning of the episode. He is also an actual, real-life sponge.
Blue Spongy is the first non-contestant character to have a speaking role in BFDI. 

Blue Spongy BFDI

Blue Kitchen Sponge. 