Mariabell Rosso

Mariabell Rosso (also spelled Maribel Rozzo in some sources) is a character who appears in the anime adaptation of That Time I Got Reincarnated as a Slime, particularly becoming more prominent in Season 3.

She is introduced as a young girl (appearing around 10 years old or petite/teen-like in some descriptions) with smooth blonde hair, pink eyes, fair skin, and an innocent-looking childish appearance that contrasts sharply with her true nature. She is the granddaughter of Granbell Rosso and a reincarnated Otherworlder (from our world, where she was previously a powerful ruler or financial dominator in her past life).

Personality-wise, Mariabell is extremely greedy, highly rational, calculating, and cold-hearted. She is known for her manipulative tendencies, using her powerful Unique Skill "Greed" to exploit people's desires, control minds, and scheme on a large scale—often aiming for economic or political domination. Despite her young looks, she acts with confidence, arrogance in her abilities, and a villainous mindset, serving as an antagonist who plots against Rimuru Tempest and others to advance her (and her family's) ambitions.

In the anime (especially around the Founding Festival arc in Season 3), she attends events like Tempest's festival in person, blending into scenes while pursuing her schemes behind the scenes. She is voiced by Inori Minase in Japanese (and Kira Buckland in English dubs).