Modding

Markel is dead, for good.
Arantir was only buried in Dark Messiah. If the events are before Dark Messiah, then it's fine to leave only him. Otherwise, he's no longer a Lord.

What if we make Arantir the main hero, and Ornelle and her vampire brother as secondary heroes for different Undead sub-factions?
Please suggest more secondary heroes.
Here's what we have:
1) Haven - Isabelle
1.1) Griffin Empire - Godric and Frida
1.2) Holy Isabelle Empire - Laslo and Alaric

2) Inferno - Orlando
2.1) Shio - Biara and ?
2.2) Lower Layer - Vaer and ?

3) Necropolis - Arantir
3.1) ? - Ornelle and Giovanni
3.2) ? - ? and ?

4) Sylvan - Faidaen
4.1) Forest Elves - Tieru and ?
4.2) Irrolan Elves - Alaron and ?

5) Dungeon - Railag or Illay?
5.1) Igg-Shail
5.2) ?

6) Academy - Zehir
6.1) Silver Cities - ?
6.2) Desert Mages - ?

I haven't gotten to the Dwarves and Orcs yet; these six factions will come first. The question marks need to be replaced with names. Secondary heroes can also be taken from regular battles.
Help me with the names of the sub-factions. They should be lore-accurate and reflect the essence of the upgrade path. Thank you.