Gnarly Knave

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The debug menu for Mario Golf: Toadstool Tour lists assets by contributor. It reveals that for this game, the team employed a "dedicated Luigi expert:" a person whose job was seemingly only to model Luigi, and nothing else.

The credits for Mario Golf: Toadstool Tour list
10 people in the "3-D Character Animation" section. The game's debug mode gives reason to believe that one of them, Masayuki Hashimoto, was specifically tasked with animating Luigi as opposed to the other animators, who did various characters or objects.
The debug mode lists animations in groups named after the staff member who made them. While other groups that have character animations are not dedicated to a specific character or object, the "Hashimoto" folder consists solely of 27 Luigi animations, suggesting this was his main job.
Note that Natsuko Takeuchi is another animator that only animated one character (DK), but she also made map objects. Oddly, while Masayuki Hashimoto is also listed under "3-D Map Graphics", no such graphics appear in his menu; it is unclear what he did. The only evidence is of his work on Luigi.
Source: MG:TT (NA, GC), screenshots taken by Supper Mario Broth