Here is an introduction to Mari's second job, Gun Slinger.
Mari retains rocket jump. Mari keeps cannon creation (making better cannons, now) Mari retains orb creation, even creating an ice blast instead of one of them. Mari keeps sword summoning. When Mari runs out of ammunition her jump attack changes. When Mari taunts a helper bot appears, frightened. Range on the gun is actually pretty good, screen's length. It is aimed the same way crossbow is. It can be fired backwards as well.