Playing through the game one of the main things that I wish is that your party members dialogue would be an option when you talk to an npc.
What I mean by this is that it seems like the dialogue options that you have when you talk to an npc are limited to whatever character you have selected.
So for example, if you are an undead and you have the Red Prince active in your group, then you talk an npc that has unique dialogue with the Red Prince you will not see this unless you start a conversation with the Red Prince selected instead of your main character.
It'd work better, imo, if your party would be able to talk to npcs and offer their own unique dialogue as an option regardless of who you have selected in your party.
So like if you initiate a conversation with an npc in the dialogue box you would see the normal dialogues and also any unique dialogue options available to any character in your party with that npc.
So if I initiate a conversation with an npc with my main ciharacter and then The Red Prince has something unique in his dialogue, it'd show up in my dialogue choices and the red prince would ask the question without having to leave and then select him and start the conversation with the Red Prince selected.
As it stands I feel like I'm missing out on a lot of great dialogues and unique options because I'm not having each member in my party all talk by themselves to the npc's.