Rot-Zug is a small varisian wayang wizard of Urgathoa. He's a solitary necromancer that suffers from a silent disease that's slowly killing him, as he was born with poisoned blood (Poison Minion racial). He's socially awkward among living creatures, feeling more at home when he's surrounded by undead creatures. The only real company he has, it's his Familiar named Pigro, which is a soulbonded crystal familiar, surgically inserted into the corpse of a cockroach.
At the moment, he doesn't entices the idea of sharing his illness with the world, since his only connection to Urgathoa was that it was instilled in him from childhood, as well as the awe of her escaping from the clutched threads of death woven by Pharasma through sheer will to live.
When he is not constantly sleeping due to the physical exhaustion caused by his illness, he spends his time doing necromancy and dressing his skeletons with clothes so they "don't feel the cold of death".
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Mechanically, Rot-zug usually feels tired and lazy during battles, tending not to move around much on the battlefield if it's not necessary, casting haste and other buffs among his allies so they can do the heavy lifting. He also is able to bring debuffs and control spells (Black Tentacles, Create Pit, Wall of Force) to make things easier for the rest.
But he's a capable blaster, normally bringing fireballs from all types and sizes; As well as having strong necromantic spells (Enervation, Boneshaker, Possesion/Suffocation) to throw at the enemies. Although, he doesn't have high saves nor defenses, besides casting ofc (Mirror image, Shield).
He usually rises dead enemies as bloody skeletons to bring them with the party, if given the chance.
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Only abilities that would come to mind to have an eye for is that he uses Shadow Speaker a lot to gain bonuses on attack rolls or saving throws, as well as ability checks to make opposed Charisma checks against undeads.
Also, Rot-zug has Magical Lineage & Wayang Spellhunter traits, both linked with Fireball and lowering the metamagic increment by 2. So he usually brings empowered fireballs at 3rd-level or quickened at 5th (Not that it's going to help that much in Hell tho)
He tends to use Fate's Shears a lot too to make the enemies reroll their saves.
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I haven't played him in a long while, so I'm still working on him and seeing what purchases to make. Thinking on probably learning 'Planar Adaptation' so he could cast it for this scenario, so he doesn't has to depend on scrolls.