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Dehaka is bipedal with two pairs of arms, one large and one small, though he is missing his right large arm and left small one.
Dehaka lost his large right arm prior to the Swarm's return to Zerus; it was later to be found in the same area where Sarah Kerrigan defeated the other primal pack leaders. It was noted to still be "bleeding profusely," implying he had only lost it very recently.
Dehaka perceived Kerrigan as the strongest zerg. He and his pack welcomed the new power by allying with the Swarm, believing Kerrigan would lead them to new essence. Dehaka correctly predicted that the other pack leaders would refuse to similarly adapt; the other pack leaders were destroyed by Kerrigan, including Zurvan. Dehaka sent some of his pack to assist Kerrigan in killing them.  Kerrigan confronted Dehaka afterwards, confirming that Dehaka had known that Zurvan would turn on her. He did not deny this—one zerg would grow strong, the other would fall. He claimed that as zerg, Kerrigan already knew it to be inevitable. Dehaka remained with the Swarm.
The following section contains timeline information which isn't necessarily in chronological order.
The Swarm arrived at Skygeirr Station, a Terran Dominion base. Dehaka was perplexed at the structure, but was nonetheless content, and eager to sample terran essence. Essence of another kind existed within the base however, that of protoss-zerg hybrids. While their essence was strong, Dehaka could not collect it. He knew the beings' creator served Amon, a being that would "devour all essence." Dehaka believed that if Amon succeeded, all change would stop, and all essence would be collected. And he was willing to fight to prevent that from happening.
Working with Terrans
The Swarm operated with Raynor's Raiders with the intent of retrieving Jim Raynor from Dominion custody. Dehaka was disgruntled by the lack of essence to be found, and exchanged verbal barbs with Broodmother Zagara. Kerrigan broke up the altercation, and forbid Dehaka from collecting essence in the area. Raynor was successfully rescued, but Dehaka noticed Kerrigan's silence afterwards.
Kerrigan took the Swarm to Korhal, intent on deposing Emperor Arcturus Mengsk. Dehaka noted the abundance of essence on the world, and how different it was from essences he had encountered in the past. He and his pack would collect it.
With the deployment of the Psi Destroyer, Dehaka and his pack were at an advantage, as they lacked the psionic connection that Swarm zerg shared. This made him immune to the Destroyer's effects, and he and his pack were able to sabotage its power links, allowing Kerrigan's zerg to destroy the device, giving the Swarm access to Augustgrad. Soon afterward, Dehaka and his pack participated in the final attack on Korhal Palace.
After Korhal, Dehaka strengthened his pack. He returned to Zerus, where he incorporated three pack leaders, Glevig, Murvar, and Dakrun, into his pack. During the End War, he led the primal zerg against Amon and his forces. He was aided by his new pack leaders, who followed him for his strength.
Heart of the Swarm
Dehaka targets a unit and pulls that unit to his location, stunning it for a short time. This allows him to pull allies to safety, or pull enemy units out of position. The ability can pull units up and down cliffs.
Creates two Spawn of Dehaka at target location. Spawns have 50% HP but deal full damage. Spawns last 30 seconds.
User instantly heals self for 150 HP and nearby units for 50 HP. An additional 50% of the HP restored to affected units is rapidly healed over 15 seconds.
There are also unfinished commands in the map editor for two additional abilities; Devour, where Dehaka bites an enemy to deal damage and heal HP; and Flurry, where Dehaka rapidly attacks around him dealing splash damage to nearby enemies.
Heroes of the Storm
Personality and Traits
Dehaka is a survivor first and foremost, and possesses both cunning and a strong will to survive, and believes that one must continuously evolve in order to stay on top. He is fixated on collecting essence, but not for the sake of power. Power, in Dehaka's mind, is a trap, and one the other pack leaders fell into. For Dehaka, essence is survival. He is willing to make alliances when it suits him.
Dehaka views primal zerg as the "true zerg" (as opposed to their Swarm counterparts).
Dehaka reflected that he had changed much since joining Kerrigan's side. Cunning and wise, he remains one of the strongest surviving primals. Few primals have undergone as much change as Dehaka, and he intends to keep it that way.
- Dehaka might be named after Azi Dahaka, an evil figure in Persian mythology.
- Dehaka's appearance is markedly different in Heroes of the Storm. His highlights now glow pink, and his tusks are replaced by more insect-like mandibles.
- Map editor files for Dehaka allude to a different personality intended during development: "Eager and not too bright. Loud, speaks in a yell."
- Dehaka was matched against Alexei Stukov on the StarCraft Twitter. 57% of voters claimed that Stukov would win.
- Dehaka is the only known zerg known to possess hair, having a shaggy goatee-like beard.