Of the 18 followers, 7 are being expanded to include commentary on every quest and location in the game, including bonus conversations during or after major questlines. Currently, these followers, whom I have dubbed "Super Followers" because they fly and wear capes, have approximately 500 lines each, with the ultimate goal of having thousands. However, any follower can be expanded, it simply requires a willing actor.
The size of the mod is over 1GB, and will only get larger. If anyone is interested in constructing smaller, child mods for specific followers or NPCs, you have my approval. Just beware that some NPCs are still expanding, and you will constantly have to add new content as I update.