Demons and their souls

I was reading something on Frieren wiki... and found out that demons also have souls....

That makes me wonder... will not only Frieren meet Himmel, Heiter and Flamme in Ende... but also Aura, Qual, Demon King, Solitar and probably others (from both anime and manga)....

With Aura we can ofcourse have a big laugh if they met (again)... though potentially, demons MAY have different place for their souls.... but for now it's speculation. What do you think of it? I do know their bodies do turn into mana and disappear... but souls.... that's interesting concept.