Pepesha "Spirit" Andreanova

Pepesha Andreanova, better known as Spirit, is Russia's Hero and Shy's mentor and friend. She is well known as an alcoholic and is usually seen drunk. Pepesha becomes more relaxed when drinking, and she herself points out to Teru that she wouldn't recognize her sober.

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It is revealed, however, that she drinks due to her mother's influence, who also drank to show more emotions to her daughter.

(Source: SHY Wiki, edited)