successful role; hit role
Refers to a role in a play, film, or performance that suits the actor perfectly and becomes a major success or defining part of their career.
このドラマの主役は彼の当たり役になった。
The lead role in this drama became his signature successful role.
That actor was blessed with a hit role and quickly became popular.
This detective role became his signature part.
She played a defining role in that production and became instantly famous.