the "New Tardis Mod" has a companion system (technically WIP but it is functional) that allows NPCs to co-pilot the tardis and generally just be involved as "companions" do. it would be interesting to see MCA make use of its API to allow some interaction. perhaps even some unique dialogues and mechanics to accompany it (such as secondary integration with the "regeneration" mod which is often paired with NTM. maybe even being able to turn your companion into a timelord too). ofc this is just a suggestion and you dont have to if you dont want to but i figured it would be cool to do and so im bringing it to your attention here :)

https://gitlab.com/Spectre0987/TardisMod-1-14