Mazu

Currently skills can be added only in Talkie website version (Talkie Creation Center). However website version misses some features of the app: tags, more advanced voice edition, it has got also less image styles to choose from. You can edit your NPC in both app and website.

I found that during defining themes or exclusive cards it helps when you copy prompt from the main photo of the NPC and paste it into theme/gacha definition (especially in the case of a theme), and then update text to your needs for that scene. If done this way it seems to be more consistent, more similar to the character.

I don't have much experience in creating two Talkies in one image, except my older Talkie named Elena (in story collection "Elena and Katherine"), however she was created some time before they introduced more strict rules. People on Talkie's Discord might help you more.