Like this?
"Shadow Hunter" class. Uses mail armor, available to Trolls, Undead, Draenei and Night Elves. Maybe others, but these are the ones I could think of some explanation behind. The class visuals would be somewhat different for each race.
Specs:
- Warden (Tank): Agility-based. Summons Spirit of Vengeance (a voidy version of yourself) to help soak damage, can Shadow-step to teleport to targets/allies, places wards that reduce damage taken by party, Fan of Knives summoning shadowy blades to AoE things. Simulates both classic night elf Warden and a melee Shadow Hunter.
- Dark Ranger (Ranged DPS): Agility-based, uses ranged weapons. Can both throw spells or use shadow-enhanced shots. Kinda like a hunter, but more spell-based. Can teleport around (like Blink), Black Arrow (summons voidy minion that varies by race: a night elf spirit, a voidy skeleton, voidy beast and so on), silence, mind control and so on. Would tackle some Priest of the Moon-like spells (color varies by race) so people can simulate both a Dark Ranger or a classic Priestess of the Moon with it.
- Witch Doctor (Healer): Intellect-based. Has Healing Ward and Serpent Ward, maybe some others, but not step too much into shaman territory. Big Bad Voodoo and other dark magic spiritual spells.