Having played SC2 for some time now, I think Blizzard could add up to seven commanders for Co-Op missions. The commanders I think they could add are: Gabriel Tosh, General Warfield, Mira Han, Zeratul, Talandar, Dehaka, and Niadra. From what I’ve gathered, Dehaka is in the works. But Niadra, her tale is a forgotten one, only in the HotS campaign, could be a strong commander.
Niadra, Forgotten Broodmother:
Niadra:
Broodmother: Niadra can spawn Zerglings, Roaches, Hydralisks, and Mutalisks once she hatches. She also gives 30 supply upon hatching.
Royal Essence: Swarm Queens and Brood Lords can gain essence/biomass from fallen enemies and further their evolution. 100 then 200 essence/biomass to stage up and spawn more units and increase supply.
Psionic Cunning: Niadra grants a chance to dodge an attack in an area around her, as well as detection.
Hatchery, Spawning Pool, Roach Warren, Hydralisk Den, Mutalisk/Greater Spire, Spine Crawler, Spore Crawler, Evolution Chamber
Upgrades:
LV1: Advanced Spawners. Queens can spawn ground units, and Lords can spawn air units.
LV2: Heart of Creep. Upon death, Queens spawn a Creep Tumor.
LV3: Quick Gestation. Decreases the time it takes to hatch units.
LV4: Tier 2 Upgrade Cache. Access to tier 2 and Lair level upgrades for units.
LV5: Raptor Strain Zergling. Zerglings can jump up and down cliffs, and over units and structures.
LV6:Toggle Scourge. Brood Lords can toggle from Broodlings to Scourges.
LV7: Transfusion Aura: Niadra can heal all nearby units at once
LV8: Pure Essence: Enemies killed by Queens and Lords drop 100% more essence/biomass.
LV9: Toxic Creep. Creep slows down enemy units and causes damage over time.
LV10: Tunneling Claws. Once researched for Roaches, all ground units can move while burrowed.
LV11: Tier 3 Upgrade Cache. Access to tier 3 and Hive level upgrades for units.
LV12: Corpser Strain Roach. Spawn Roachlings from dead enemies.
LV13: Royal Detectors. Queens and Lords gain the ability to detect cloaked enemies.
LV14: Torrasque Strain Queens. Queens can be revived upon death, leaving behind a Creep Tumor upon re-entering the battle.
LV15: Shadow Swarm. Niadra can cloak all allies on the map for a short duration.
Larva can morph into Drones, Overlords, Swarm Queens, and Brood Lords.
Swarm Queens can spawn Zerglings upon hatching, Roaches at stage 2, and Hydralisks at stage 3. Brood Lords can spawn Mutalisks upon hatching, Corruptors at stage 2, and Guardians at stage 3.
Swarm Queens cost 0 supply, 200 minerals, and 100 vespene. Requires Hatchery and Spawning Pool. Brood Lords cost 0 supply, 250 minerals, and 250 vespene. Requires Mutalisk Spire and Lair.
Supply increases with unit stage. Stage 1, 8 supply. Stage 2, 15 supply. Stage 3, 30 supply.
Hatchery requires Spawning Pool to evolve into Lair. Lair requires Mutalisk Spire to evolve into Hive
Spawned units cost minerals, vespene, supply, and energy.
I know Niadra is just out there somewhere hunting down Protoss and terrifying all telepaths but man I feel sorry for her. I wish I can just take her back and y'know. Let her be my second in command instead. I feel so bad just leaving her in Kaldir.