While I am not a big summoner fan, i love the idea of a supporting minion.
If it has enough support value for the player, this might be even a thing for a non minion build, if you can keep it alive.
The most important thing EHG learned from Dread Shade needs to apply here a well:
Don’t make it too strong, since it would become mandatory to pick.
I would suggest capping how many targets this minion can buff at the same time.
Maybe even nodes, that heavily limit thee nubmer of target it can buff to favor playing it in conjunction with Abomination or to only buff the player.
I only think that what you suggested does not sound like a pure “support” minion.
They do consider since the very beginning, they never said “We don’t wanna do this”.
It’s just a matter of ressources and priorities.
Different Models/Gender do cause A LOT of extra work (animations, voice, 3D arts like armour etc.)
In case you are interested, there is a VERY lenghty discussion including some comments from devs.
I linked to the comment from Mox, but the whole thread is very interesting.