I know not all of them are listed, but just add one if you want.

it i'll be interesting reading about bellatrix and the black sisters much more

Lupin
Snape
Bella

Definatly Bellatrix ♥

For sure.

Or Bellatrix. That would also be interesting to me.

and Dumbledore!

Gotta go with my fave character <33333 BUT Sirius could be cool and Snape too ^^ and of course, Bellatrix :D!

then:
Remus
Tom Riddle
Dumbledore

But if I had to choose:

Lupin(the werewolf part of his life)
Snape(his miserable childhood)
Bellatrix(how she became so evil)
Lily(Petunia and what happens)
Sirius(how he met James)
We already know a lot about Dumbledore's life.

That's weird. I really thought I had added Lily.

Reading about Bellatrix would be a funny read

Dumbeldore and Voldemort would ALSO be very interesting.

Seeing he is my favourite character, yeah...

Snape for sure

Next would be Lily and Remus, but they'd be in the story about Snape anyway! :)

Definitely :))))

Sirius ;) from what is mentioned in the books, we know that he had a terrible childhood, mostly because of his mother (hateful b*tch :P) and I'd love to read about it.
That's why definitely Sirius ;)

God I would seriously read them all! :D

But gotta go with my favorite character, Sirius. <3

Then Snape and Bellatrix.

I think that reading about Snape's childhood would make me very sad and maybe i'll cry,so i would be interesting in how Bellatrix became who she is.

Snapes's would be a bit depressing.

All of theirs are probably sad except for James and Lilys.

and Bellatrix's, hers will probably be just plain odd.

I want to see what Lilys childhood was like for no particular reason

Snape

Dumbledore and Sirius, I would enjoy those.

I'd love to read about little Severus. He had really sad childhood, but I like sad stories :)

even though i picked snape i am intrigued by dumbledore's childhood also.

Snape and Dumbledore

Snape
Dumbledore
Voldemort
Remus
Sirius

They would all be interesting... but if i really had to pick it would be sirius or snape :)

Or Remus. Or Bellatrix. Or Voldemort...

How about anybody but Sirius, Dumbledore, James, and Lily?