[@Mae]

Location: My succubus has no problem with any types of location. However, [@Kenshi] might want a quite spacious one for his labyrinth, and [@Dark Cloud] might want a more stable terrain type for his tunnel. That would probably put islands and swamps out.

Monsters: As long as I'm allowed to narrate my minions recruitment process similar to an ant queen (I also have Namekians in my imagination), i.e. birthing same-species offsprings using a Gold-consuming process, then any creatures in the vicinity is fine. Otherwise, I need a chance to have random succubi groups around. Regardless, the area should have some Kobolds and Minotaurs population to exist. The slime can have the same way of recruiting like my succubus if [@Lucius Cypher] want, using mitosis for same-species minions.

Factions: For my own character's heretic church to thrive in its initial phase, it is very reasonable for her to stay away from any possible holy orders, demonic cabal, or any organized mages around the dungeon.

Good-guy folk: Any humanoids (humans / dwarves / halflings / gnomes / elves) are fine as long as there's a large portion of demographic distribution that my character can seduce.