Ok, here is a short preview of my hero:
(Nameless) Combat engineer
Story: Will be added when i'm finished D:
Role: This hero is a supporter for mechanical units and is perfectly made to distrub the enemy troops completely and forcing him to destroy his own mechanical units. His counter is simple: He has a melle casting range, so keep him far away from your machines, or use no mechanical units.
Abilitys:
Take-Over (Active):
The engineer goes into the targeted mechanical unit, controling it while being able to enchance the targed while occupied.
Stage 1 - Grants control of the target, add the "deboard"-ability.
Stage 2 - Add aditional a health regeneration of 2 per second to the target.
Stage 3 - Enables "nanite field", when learned.
Range: 200
Duration: Infinitive or until "unboard" is cast or the target dies
Cooldown: 80 seconds
Targets mechanical non-hero ground units only
The main ability of this hero, making him flexible by taking over enemy units while protecting himself. Synergies with almost any other ability of him when used right. (Balancing will follow later)
Repair drones (Active):
Releases drones upon a target mechanical unit, healing it until the drones are destroyed, the spell is recasted on the same target or their lifespawn of 20 seconds ends. Each drone heals 2 health per second and possesses 75 health.
Stage 1 - Releases 4 drones.
Stage 2 - Releases 5 drones.
Stage 3 - Releases 6 drones.
Range: 700
Cooldown: 10 seconds
Targets mechanical units only
Regeneration spell for 160/200/240 health, a worthly support skill, which can be countered by destroying the drones.
Nanite field (Passive):
Spreads nanites all around the engineer, fortifiing the machines around him, increasing the maximal health.
Stage 1 - Increases health by 25.
Stage 2 - Increases health by 50.
Stage 3 - Increased health by 75.
Range: 500
Affects mechanical units only
A simple max-hp-aura. Synergies perfectly with the drones which are affected also.
It is already completed and customizeable
Engine Bomb (Active) (Ultimate):
Changes the engine of a mechanical unit turning it into a bomb, increasing its movementspeed by 50%.
After 20 seconds, or when the unit is destroyed, the bomb explodes, killing the unit and dealing 300 damage in an area of 300.
Range: 100
Cooldown: 30 seconds
Turning an enemy or ally mechanical unit into a running bomb, will be nice

Edit: I will change this ability the way that the bomb will be dropped and is ticking further, but can be destroyed then without exploding.
By the way: Is this taken as a WIP or should i post a preview-map?
Edit:
Credits go to:
Modelcreator:
Kwaliti for the "T-51b Power Armor Unit (Non-TC)" model (Cobat Engineer)
M0rbid for the "Alien Drone" Model (Repair Drone)
Icons:
Kwaliti for the "Power Helmet" Icon (Combat Engineer)
Kola for the "Drone Armor" Icon (Repair drones)
Matarael for the "mine" Icon (Engine bomb)
InfinityNexus for the "AutoRepairBots" Icon (Nanite-field)
Crowolf for the "Power Grip2" Icon (Take-over)