Which anime is Lala from?

Lala appears in Doraemon (1979).

What role does Lala have in that anime?

In Doraemon (1979), Lala is listed as a supporting character.

Lala appears in several anime, including Doraemon (1979), Doraemon Movie 13: Nobita to Kumo no Oukoku, Doraemon (2005) Specials.

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Hoi's mother. Appears in "Nobita's Small, Small Great Adventure" (のび太の小さな小さな大冒険).

Doraemon (1979)

Doraemon Movie 13: Nobita to Kumo no Oukoku

Doraemon (2005) Specials

Doraemon

Daichouhen Doraemon