I've been worrying for a while about 'dropping' characters between the three distinct sections of my novel. I'm happy with the plot, and it makes sense for these characters to not be present as it progresses (they're not dead, just not around).
Most of these characters get 2-3 scenes max, and they're gone. The entire book is told from limited 3rd person POV of the MC.
Part 1 - I introduce various characters as part of the MC's daily life, they're involved in incidents and fleshed out a little. There's some friends, family and colleagues.
Part 2 - after the inciting incident, it feels necessary to 'drop' these characters almost completely. It would be difficult to logically justify their presence, and they don't fit the new situation and location.
Part 3 - err...I do it again. Major characters from part 2 are left behind - this is good in the case of the mentor characters and the MC having to stand by themself, but it feels a little...bare? on the character side. I'm strongly considering trying to engineer at least 1-2 minor characters going with the MC here to keep a little continuity.
Obviously there's all the usual advice about beta-readers and "if you do it well, it's fine", but I'm curious to know whether you guys feel this is an inherently bad idea?
Any thoughts about how to reduce the impact on the reader? (e.g. I try to refer to friends/family sometimes in the new settings, and how the MC feels they may react to events)
Any examples of literature where this has been handled successfully would also be really helpful.