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This post was brought to you by the letter 'o'.
I found a few 3 letter combinations starting with 'o' that change the art style.
I think "obu" might be Ange Katrina from Nijisanji, but I'm not sure. It consistently generates the same character anyway.
You can get the Pokemon Riolu with "olu", but that's just tokenization at work. "riolu" also works.