Wilfred Fizzlebang by SnowChaser

First things first, I take no credit for any artwork I have used, most of it is official blizzard stuff and some of it is fanart. This concept was heavily inspired by the fact that i think summoners are so much fun to play and there aren't enough.

Level 1

Anguish - Quest: Damage enemy Heroes with the area effect of Agony.
Reward: After damaging Heroes 20 times, reduce it's mana cost by 5 and increase it's explosion radius by 20%.
After damaging Heroes 40 times, reduce it's mana cost by a further 5 and increase it's cast range by 20%.

More Mistakes - Quest: Gathering a Regeneration Globe increases Wilfred's Mana Regeneration by 0.1, up to 2.
Reward: After gathering 20 globes, reduce the cooldown of Summon Doomguard? by 30 seconds.

Lesserlings - Imps and Voidwalkers deal 30% more and take 30% less damage from minions and mercenaries.

Level 4

Messy End - Flame Imps explode when they die, dealing 150 (+4% per level) damage to nearby enemies

Devilish Fortitude - Flame Imps gain 75 armour against their first 2 enemy heroic basic attacks, reducing the damage taken by 75%.

Crippling Agony - Enemy Heroes damage by the area effect of agony are slowed by 15% for 1.5 seconds.

Trauma Care - Voidwalker's impact reduces enemy Hero's healing received by 75% for 2.5 seconds.

Level 7

Big Brother - Voidwalker grants nearby allied Heroes, minions and mercenaries 10 armour, reducing damage taken by 10%

Agonising Enchantment - Agony Increases the damage of Wilfred's next 2 basic attacks to deal 80 (+4% per level) bonus damage. If both hit the same enemy hero, an untalented agony is cast, targeting the Hero.
Passive: Increase Wilfred's basic attack range by 25%

Siphon - Active: For the next 5 seconds, restore 0.5% of your maximum mana every team a nearby minion dies.

Level 10

(see above)

Level 13

Ice Block - Activate to place yourself in Stasis and gain Invulnerability for 3 seconds.

Unending Resolve - Active: Spend all your mana and gain a shield equal to twice the mana spent. Regain the mana spent when destroyed or
after 6 seconds, when it expires.
Demonic Empowerment - Active: Imps and Voidwalkers gain 50% movement speed and Invulnerability for 3 seconds.

Level 16

Grimoire of Supremacy - Voidwalker Lasts Indefinitely, but only 1 can exist at a time

Grimoire of Service - Flame imp gains a second charge

Grimoire of Synergy - Imps and Voidwalkers deal 35% bonus damage to enemies afflicted with Agony

Level 20

Dramatic Entrance - Summon Infernal Stuns enemies for 1.5 seconds on impact before knocking them back.

Dramatic Exit - Fel Fissure explodes when it expires, dealing 200 (+4% damage per level)

Master Summoner! - Replace Summon Doomguard? with Summon Jaraxxus! Summon Jaraxxus! deals 20% more damage and his basic attacks apply agony. No longer damages Wilfred

Demonic Circle - Summon a Demonic Circle at Wilfred's location. Activate to teleport Wilfred to the Demonic Circle.

The numbers were theory crafted very, very loosely, so it's more than likely that Wilfred Fizzlebang is grossly overpowered, So he'll fit right into the recent cast of HotS (I'm kidding, leave me alone) but if anyone has too much time on their hands or has theory crafted a similar design before would like to get in touch, I am more than open to hearing what you have to say, as i am about any other constructive feedback or just generic praise <3. I would like to thank you for reading through my wall of text, and Would greatly appreciate anything anyone has to say about it, THANKS!