As a Note, the Story NPC's most generally represent BASE CLASSES (e.g. Merlwyb - Musketeer, Raubahn - Gladiator, Thancred - Rogue).

Merlwyb is a Musketeer, this speaks nothing of what Job Musketeers develop into.

There is no clue as to the Musketeer's Job-Branch in her or in Limsa's Musketeer's Guild.