The ghoul and the geist are pathetic, the skeleton is too Frosty.
After all customizations unlocked for Demonology and even Druid, we still remain with the three badlook choices while there are TONS of cool looking undead minions everywhere in WoW… So when are we getting customization for unholy pets?
Some skeleton, abomination, maldraxxus undeads… There are hundreds of existing options already, just let the players choose.
I mainly would like to be able to rename the minions on both DK and Locks
Truthfully speaking, I don’t think Death Knights would care all that much about what their undead servants look like unlike a Hunter or even Warlock.
To them they are merely tools to be used and discarded.
Every playable Race has it’s own skeletal model.
Those could all be DK pets 
It depends on the DK.
Thassarian never leaves his home without his trusted skeleton Lurid
(or at least he did before we killed Lurid lol)
https://wowpedia.fandom.com/wiki/Lurid
I am surprised they don’t get any customization. Tons of undead models to choose from.
I would love to be able to customize my gimp, and name it…
In Shadowlands, Maldraxus had a nice system of stiching your undead companion. It was there, ready, they just didn’t care enough to implement it and give it to the Death Knights…
I would love a permanent abomination pet. They are so much more entertaining than the ghoul, geist or skely.