Okay, so you want unique heroes with a few abilities that work together but can also stand alone (so you can make a purchasing system)? Here you go (abilities are listed in no particular order). Also, please assume that each of these units have some form of basic attack.
(BTW, @Chiquihuite, I think the Archon would be a good model for the Photomancer.)
BLACK GUARDIAN - Kerrigan model.
General Idea: uses crazy AoE abilities to cause chaos while buffing itself, so it can stay in the fray. Melee-type basic attack.
Kraken Eye - AoE, short radius around character. Causes enemies to flee for a short time. For every enemy affected, your Movement and Attack Speed and maybe your Health are buffed. Effect: your enemies flee while you chase them down and destroy them.
Soul Harvest - While this ability is in effect, every kill you make buffs your health and mana. (Assuming that we have to survive against hordes in some capacity)
Livid Virus - Targets single enemy. Releases a virus which causes said enemy to attack its allies for a short time. Each time affected enemy attacks, the virus has a chance to transfer to the target. Effect: clusters of enemies fighting each other.
Chaos Aura - AoE, affects targeted area of the battlefield. All enemies within that area, when affected by one of your spells, take additional damage every time they are attacked. Effect: greatly increases the effectiveness of your other abilities, and gives your allies an attack buff.
BLUESTREAM ARTIFICER - Tassadar model.
General Idea: uses mental/illusion abilities to defend himself and confuzzle enemies. Ranged basic attack.
Phantasmal Wall - AoE, targets the battlefield. Creates a temporary wall in an arc shape that blocks movement and melee but not ranged attacks. The wall cannot be attacked directly but takes damage from AoE spells. Effect: fantastic choke point control, but at a price.
Obfuscate - Targets single enemy. Removes their ability to use spells and ranged attacks directly, instead of draining mana or some such. Effect: allows your Glass Wall to last longer.
Umbra Transfer - Temporarily mind control an enemy. Character cannot maintain any other spells while using this spell. Effect: good for single encounters, but risky. Amazing if used strategically.
Bluestream Loop - creates a power field which allows your free-standing spells cast within the area to be self-powered. Effect: allows you to simultaneously use Glass Wall and Shadow Puppetry. Think about it.
BLAZING ACOLYTE - Firebat model
General Idea: this high-energy holy warrior consumes his enemies to increase his own power.
Infernal Fireball - this ability charges for a set amount of time before dealing huge damage to a single target (must stay in range during charging). For every kill you make during the charging period, the fireball's damage increases. Effect: great for dealing with a swarm of enemies plus a boss.
Ultimate Devotion - Blazing Acolyte lights himself on fire, and takes damage to greatly increase his damage, attack speed, and crit chances. Enemy units around him take Fire splash damage. This may or may not be a suicide attack. Effect: if it's your last stand, make yourself remembered.
All-Consuming Aura - Every time the character makes a kill, you gain health almost equal to the health of the enemy you killed (If this is Hero vs. Horde, that should be balanced, as heroes have major health while enemies have tiny health but do big damage). Effect: allows you to survive at the center of the fight.
Holy Fireball - AoE, target battlefield. Deals major damage to all enemies, AND ALLIES AND YOURSELF IF APPLICABLE, within the target area. For every enemy killed by the initial attack, the fireball's effect radius increases. Effect: this is the Nuclear option. Given enough small/low-health units, you could wipe an entire horde. Beware: this fireball can expand faster than you can run. (very useful in conjunction with Infernal Fireball).
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Okay, so you want unique heroes with a few abilities that work together but can also stand alone (so you can make a purchasing system)? Here you go (abilities are listed in no particular order). Also, please assume that each of these units have some form of basic attack.
(BTW, @Chiquihuite, I think the Archon would be a good model for the Photomancer.)
BLACK GUARDIAN - Kerrigan model. General Idea: uses crazy AoE abilities to cause chaos while buffing itself, so it can stay in the fray. Melee-type basic attack.
Kraken Eye - AoE, short radius around character. Causes enemies to flee for a short time. For every enemy affected, your Movement and Attack Speed and maybe your Health are buffed. Effect: your enemies flee while you chase them down and destroy them.
Soul Harvest - While this ability is in effect, every kill you make buffs your health and mana. (Assuming that we have to survive against hordes in some capacity)
Livid Virus - Targets single enemy. Releases a virus which causes said enemy to attack its allies for a short time. Each time affected enemy attacks, the virus has a chance to transfer to the target. Effect: clusters of enemies fighting each other.
Chaos Aura - AoE, affects targeted area of the battlefield. All enemies within that area, when affected by one of your spells, take additional damage every time they are attacked. Effect: greatly increases the effectiveness of your other abilities, and gives your allies an attack buff.
BLUESTREAM ARTIFICER - Tassadar model. General Idea: uses mental/illusion abilities to defend himself and confuzzle enemies. Ranged basic attack.
Phantasmal Wall - AoE, targets the battlefield. Creates a temporary wall in an arc shape that blocks movement and melee but not ranged attacks. The wall cannot be attacked directly but takes damage from AoE spells. Effect: fantastic choke point control, but at a price.
Obfuscate - Targets single enemy. Removes their ability to use spells and ranged attacks directly, instead of draining mana or some such. Effect: allows your Glass Wall to last longer.
Umbra Transfer - Temporarily mind control an enemy. Character cannot maintain any other spells while using this spell. Effect: good for single encounters, but risky. Amazing if used strategically.
Bluestream Loop - creates a power field which allows your free-standing spells cast within the area to be self-powered. Effect: allows you to simultaneously use Glass Wall and Shadow Puppetry. Think about it.
BLAZING ACOLYTE - Firebat model General Idea: this high-energy holy warrior consumes his enemies to increase his own power.
Infernal Fireball - this ability charges for a set amount of time before dealing huge damage to a single target (must stay in range during charging). For every kill you make during the charging period, the fireball's damage increases. Effect: great for dealing with a swarm of enemies plus a boss.
Ultimate Devotion - Blazing Acolyte lights himself on fire, and takes damage to greatly increase his damage, attack speed, and crit chances. Enemy units around him take Fire splash damage. This may or may not be a suicide attack. Effect: if it's your last stand, make yourself remembered.
All-Consuming Aura - Every time the character makes a kill, you gain health almost equal to the health of the enemy you killed (If this is Hero vs. Horde, that should be balanced, as heroes have major health while enemies have tiny health but do big damage). Effect: allows you to survive at the center of the fight.
Holy Fireball - AoE, target battlefield. Deals major damage to all enemies, AND ALLIES AND YOURSELF IF APPLICABLE, within the target area. For every enemy killed by the initial attack, the fireball's effect radius increases. Effect: this is the Nuclear option. Given enough small/low-health units, you could wipe an entire horde. Beware: this fireball can expand faster than you can run. (very useful in conjunction with Infernal Fireball).