Tanks - Titans and Warlocks
Support - Hunters
DPS - All three can DPS
It already exists in the game.
English
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Yes and no. Currently stats like Resilience could theoretically make any class "tanky" (bad example as resil does so little) but a Tank is more than a bullet sponge. A Tank draws fire from his allies and or defends them. The Titan barricades and the Sentinel's bubble fulfil the defensive role, but they don't innately draw enemy fire and aren't effectively any tougher than any other Guardian. There are only a couple abilities that create a manner of healing such as Rifts or a Sentinel's melee kills (which might be the only ones...). So no defined healing role. Hunter's have utility, but mostly unto themselves outside of Tethers. Smoke Grenades can fit into utility, but if that concession is made, so do certain Titan melees. And yes, all are effectively DPS (which shouldn't change) but some are more than others.