Scar by affekopp

Tier 1 (1):
-Enhanced Quadriceps: Increase the range of Bite by 20%
-Spiky Carapace: Reflect 15% of the damage back to the attacker while Carapace is active
-Agressive Acid: Increase the damage of Acid against attackers by 25%
-Block

Tier2 (4)
-Oozy Acid: Initial targets get rooted for 1 second
-Adrenal Glands: Increase your attack speed by 1,5% for each 5 seconds you are alive, to a maximum of 22,5%. These stacks are lost on death
-Acid Stains: Acid leaves a Stain of Acid behind, that deals [25 + 8 per level] damage per second to enemies who walk through. Lasts 4 seconds
-Focused Attacks

Tier3 (7)
-Infectious Wounds: Bite increases the damage and slow on the next use of Bite on the same target by 10% . Lasts 7 seconds
-Renewing Carapace: If the shield breaks of damage, reduce the cooldown by 6 seconds
-Metabolic Amplification: Increase your movement speed permanently by 10%
-Follow Through

Tier4 (10)
-Zerg Rush
-Mutation

Tier5 (13)
-Zerg Hive: Increase the max. amount of Larvae at the Altar to 4
-Zerglings have feelings too: Upon taking ability damage, reduce that damage and further ability damage by 75% for 3 seconds. Can only trigger once every 30 seconds
-Burrow: Burrow yourself in the ground and gain invurneability for 4 seconds. You can move with 25% movement speed
-Giant Killer

Tier6 (16)
-Adrenaline Boost: Carapace also increases the movement and attack speed by 15% for 5 seconds
-Improved Carapace: Increase the shield to 100% of max. health
-Faster Reinforcement: Reduce the Death Timer to 3 seconds and increase your movement speed to 200% for 4 seconds when you respawn. Using abilities, attacking and taking damage cancels this effect
-Blood for Blood

Tier7 (20)
-DNA Transmission: Zerglings are stronger and last until killed
-Ultimate Mutation: Cooldown is reset at death
-Nexus Blades
-Bolt of the Storm

Normal Skin:
Some normal Zergling Skin, with a unique face, like the avatar I used.

Master Skin:
Zergling with heavy armor applications or something.

Starcrafts Zergling:
It would be funny to have the Starcrafts Zergling in the game. With its comic style Icons and Abilities.

Corehound:
Zergling with a fiery Core hound style, maybe with 2 heads. Instead of Acid, he sprays fire.