A Vanguard with a barrier, portals and close-range magic.

Doctor Strange is a Vanguard. His toolkit combines protection and positioning.
Shield of the Seraphim creates a barrier. Pentagram of Farallah connects locations with portals. Maelstrom of Madness releases accumulated Dark Magic nearby.
Editorial suggestion: practise moving between cover and your barrier. Coordinate a portal route with teammates before committing.
This overview paraphrases the official hero page. It is not an exhaustive ability list. Numerical balance values and seasonal team-ups are intentionally excluded.

Defensive trap specialist whose web network controls chokepoints.

Teleporter and swordswoman specializing in sudden close-range skirmishes.

A Duelist with a rifle and shotgun for different engagements.