** spoiler omitted **
The Grenadier gets an ability that lets her add alchemical items to weapon attacks, i.e., Alchemists Fire + Earthbreaker, or with a dagger to help up the damage against foes with DR.
Plus, they get a short-range conical ability, too, which would make sense with a melee type. Low dex fit her character.
Plus, I think it's unclear as to whether or not I can apply my bomb admixtures to a weapon, so I figured I'd leave that option up to you.