Wayward Souls - Arena w/ Cultist
Cultist is an interesting character that can also be built in different ways similar to Adventurer. Her backstab bonus helps her take down bosses quickly, while she has a wide variety of upgrade paths that can offer crowd control, mobility, and damage.
Brisance Knife is amazing as it gives her ranged AOE that only costs energy. Viscous Vice summons slime clones that last a very long time and can take down tanky enemies solo, without having to risk yourself in the fight. Chaos Girdle is a dash that stuns, damages, and phases through everything, making it extraordinarily useful. And Ominous Black is godly for boss fights, as it does tremendous damage. Cultist has some of the most fun abilities in the game.