A couple things I'd like to see are
1. Power sets for the champion. Before you say anything yes ik the champion can change theirs at any time but what I'm referring to is something like Kiyoko's sets. Make it like 3 decks where you can have them saved and waiting to be loaded I doubt I'm the only one but I try to use ever companion equally and so I change my power sets to pick up the slack of what I'm lacking in terms of healing, generating threat, straight up damage etc.
2. Champion artwork even something as simple as a in battle bust, with the face mostly for that rpg feel though tbf thats just me.
3. Survival mode, make the trail rations more mandatory by adding a hunger meter so you actually have to eat. Hell even make it where you can order grub at the frost hound as well would be bonus.
4. When the champion gets something from Tamarind(The alchemical kitty with Gianna) the effects are applied to the entire party I'm willing to bet this a talked about feature but its still one I'd loved to see. Ik it says they always partake of what I get but I'd like to see them get the bonus effects of it as well.
5. Purification of the Alarune I personally would love a way to save her, mostly because as I recall Cait said shes was on the way to "becoming a demon". The living god Sanders worships is Velun the father of the earth(least thats what erkya dream said) so shouldn't he be able to restore her?
6. Commissions for Oggrish I feel as he hasn't had much content so by bringing him broken metal parts he can make you various armaments or weapons and the quantity of the metal parts you give determine the quality of the item.
7. Companion favors, every so often when you enter the frost hound one of your companion's approaches you and asks if you can take them somewhere, do something, or even bang.
8. Companion interactions, something to build on from the last, like every so often several of them interact with each other in various ways. Such as Berwyn and Cait practicing magic, or Brint/Brienne and Atugia sparring, Quin using lust magic on Ryn (And everyone else). Oh and I'd love to hear ever other companion's opinions on everyone else, Cait has everyone cept Kiyoko, Brint/Brienne has only Cait, Berwyn, and Ryn.
9. Garret make him something of a pseudo-companion like once every 7 days you can ask him to accompany you on your adventures.
10. Fetch Quests occasionally Garth, Sanders, Leorah, ,Ivris etc ask you to pick them up something from the various areas for what they do. Ex Winterstem for Sander's cloister, Peppers for Garth etc.
11. Donations to Sanders, by doing so Hawkthorne can slowly become a better place by improving on buildings, streets what have you.
12. Manticore submission after beating it enough times it starts to become more passive towards you and after enough time it submits to you and you have to the option to take care of it and it will move into your camps at the foothills similar to the centaur chieftan daughter(can't remember her name)