Guild Wars 2

The new NPC Scholar Mossi[Legendary Researcher] is now in LA and is wielding Axe/Pistol.

I dont think any profession can have Axe and Pistol at the same time.
Axe: Revenant, Warrior, Ranger, Necromancer
Pistol: Mesmer, Thief, Engineer

New profession confirmed?
New elite specialization confirmed?
What is this new NPC’s profession?

Totally irrelevant. Rytlock was a Warrior pre-HoT, and was seen wielding a pistol.

NPCs can often do things players can’t, whether it’s using weapons/weapon combinations we can’t or even using magic in ways that’s completely unknown to us.

In this case I suspect it simply comes down to wanting to show off as many of the new legendaries as possible and deciding that the axe and pistol makes more sense than the staff + something else.