my first stories I wrote in Dutch and were mostly 3rd person (2 very large stories both spread out over a total of 30 to 40 years... it is the story of 2 generations, the main chars for the first are strong by-chars for the second gen story) I never finished the story and it has been over 70.000 words total, I should look it up but I think it might even be close to 100.000 words.... they are both sci-fi stories.
my third dutch story was a try on a first person story, it changed character every chapter but only switched between 6 chars or so.... it was a dark romance novel with a vampire in it.
but never completed one of the story's.
now I write in first person. I have 3 stories going on. The first still switches chars because at some point the reader does need information but the main char is 'out of it' but it is only limited to 4 chars. It has a lot of flashbacks, mainly of the main chars past. And they are needed because of the need to 'feel' the emotions. Also most things that happen only unfold to the reader when another char finds things out, the main char hides a lot of things from the reader. I personally think the is working out pretty well right now.
The second story that I'm writing now is just from one point of view, it does deal a lot with flashbacks and it keeps switching between past and present. This story also deals a lot with emotions. Both these stories are Angst and romance themed, I love writing this.
The third story is a happy happy good feel story with 50/50 sex scenes and regular story. I needed something new and this is what came out. It is a slice of life story, partly autobiographical, though I'm a girl and this is about two guys. It is written from one person only and has no flashbacks since it is not needed for understanding the story or the chars themselves.
so I don't really see a common theme between my old stuff and my new stuff....