What character is depicted in the Heroes of the Storm Mage Wars Brawl portrait?

Who is the character portrayed in the portrait awarded for participating in three Mage Wars brawls in Heroes of the Storm?

Heroes of the Storm - Mage Wars Brawl portrait award


I believe it is not a named character, but the minion-wizard from Heroes of the Storm. The clothes and colors closely match, as well as the beard. The presence of the scroll roll on the back is also fairly unique.

Reference image below, with the minion in the center.

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