Skeletal Militiamen are pretty popular. Skeletal Bandit is cool too.

Lhutel and the Mausoleum Soldier ashes are great too. Very tanky and good damage output.

The Archer, Greatshield Soldier, and Putrid Corpse also fit under the umbrella of "undead looking"

Bit of a stretch but Depraved Perfumer Carmaan was seeking the “secret physick of revivification,” could make an interesting partner.

Shield bois, skellie archers, mausoleum soldiers, putrid corpse, skellie militia, skellie bandits.

I had a grimm reaper run where I personally gave dung eater the seluvis vial and counted it as "reaping" his soul to raise as my own for later. I tried the boney bros but honestly a little disappointing in most ways.