Hero idea 2, the battle golem
The Battle Golem
Strength
Crush
Grants a passive bonus to attack damage based on max life. Attacks also has a small chance to knockback.
Along with a handy disable on attack, crush's true power lies in its passive. +atk damage based on max life. This allows the Battle Golem to stack +life items instead of +damage items and still deal considerable damage.
Shield Other
Absorb X% of the damage target would take. The spell is ended if the golem falls below 30% life. The damage dealt to the golem is dealt
in magic damage.
The Battle Golem's shield...Once maxed the battle golem can ensure the survivability of those squishy agility or int heroes.
Reinforce Plating
Grants a bonus to max life. When activated grants a bonus to armour (English spelling

) and a chance that melee attackers is maimed.
Synergy with Both Crush and Shield Other. Attacks deal more damage and able to soak up a lot more damage from shield other.
Charge (ulti)
Charge to target point, knocking back, slowing and dealing damage to all units along the way.
Altough his ulti has little synergy with his other abilities, it grants him some additional hero killing ability and a nice initiator ability to get straight into combat and start destroying things.
Items to buy:
+Life
+Strenght :O (synergy with +damage and his primary ability)
+as (due to his already high damage)
+magic resist (Shield other madness)
+ms
Idea no 3
The Champion
Str
"The champion is the commander of armies. The backbone of any force"
Shout
Level 1: Reduce the armour of nearby enemy units.
Level 2: Reduce armour & attack damage of nearby enemy units.
Level 3+ Reduce the armour & attack damage of nearby enemy units and slow units with their back towards the champion.
Shout only reach its true power once it reaches level 3 and the champion has Leadership.
Rally
This or this
model
Drains mana while active. Improves the attack damage and attack speed of nearby units.
Rally is great in early ganks and with Leadership it turns the tides of battle.
Assault
Launch an attack upon the enemy.
Level 1: Bash target with your shield, stunning it for 1 second.
Level 2: Bash target, followed by a quick attack. Deals 100 damage & stun target.
Level 3: Bash target, followed by slicing all nearby units. Deals 150 damage to nearby units & stun target.
Level 4: Bash target, followed by maiming all nearby units. Deals 200 damage to nearby units, stun target and slow all nearby units for 2. secs.
Assault allows the champion to deal some burst damage.
Leadership:
(Passive)
Shout now knockbacks and deals damage to enemies. Distance and damage increase with leadership.
Rally now also improves defense and movementspeed. These bonuses grow with leadership.
Reduce the cooldown on Assault and increase its damage by [Str]*Level of Leadership
synergy is self explanatory.
The champion is a great support hero and reaches his true power when he gains his ultimate. It is advised that the champion is in a lane with as few as possible heroes to allow him to reach level 6 as fast as possible. The champion has a lower strenght gain than normal and a higher int gain that most strenght heroes. This makes him able to use his abilities, but also squishy against lots of burst damage.
Items to buy:
If you have a item equivalent of vlads (brilliance aura + lifesteal...etc...) that would be ideal.
Strenght items will help him survive longer, while mana items will allow him to dish out more damage with Assault and Shout.
Another build would be to buy support items granting auras to improve your support to the team even further.