Trauma causes another person to be made up? (caution: examples within) Spoilers ahead.

[M]

like Me & Emma and (from the reviews apparently) Holding on to Zoe

is there name for this kind of book?

I realize any suggestions will have endings ruined, but I still might want to read them...

[Valerie]

Vanishing Girls

Ugh, I know I read another like this recently but it's not coming to me right now!

[M]

Valerie - thanks for the suggestion. That one has been on my to read list for a while. The description kind of points to it vaguely.

Could the other one you're thinking of been a Ellen Hopkins book? I recall reading one by her along these lines as well.

[Valerie]

Yes! It was Identical. I just remembered. Another book that kind of fits is 17 & Gone. But to explain how would be a spoiler. I think you would like it though, given the kind of books you're requesting.

Oh and I haven't read it yet, but I think The Dead House is also in that vein, although I'm not sure the two ever meet. There is one more that is more like your examples, I just can't think of it!

[M]

Thanks! Both look really good. Most of teh books under 'readers also enjoyed' on The Dead Houses page do too :)

[Kaion]

Set This House in Order: A Romance of Souls & The Drowning Girl are offbeat versions of this. Obviously, Fight Club.

This tvtropes page has more examples: http://tvtropes.org/pmwiki/pmwiki.php...
As will this one: http://tvtropes.org/pmwiki/pmwiki.php...

[Rachel]

This happens to the main character in Mouthing the Words

[Liralen]

(view spoiler)[Zoe Letting Go
The Raft
A Beautiful Mind (the last is because of mental illness, not trauma) (hide spoiler)]

[N]

I think Uncle Vampire is another, and possibly The Other

I'm also trying to think what these kind of books would be called, or terms that help in searching for them. Both "dissociative" and the older (unfortunate) "split personality" seem to bring reasonable results in Novelist, because those are terms used in the book reviews.

[M]

all i could think of was 'invisible friend' but that would seem aimed at young kids.

will search using those terms Nancy. Looked at and added the other books suggested.

Thanks everyone :)

[Kimber]

Can't believe no one has mentioned The Dark Half by Stephen King (Richard Bachman)! Great example of this kind of book.

[Rainbowheart]

The Museum of Us
The Night I Disappeared

[Rainbowheart]

Damage

[Rainbowheart]

As Long as the Lemon Trees Grow

[Gillian]

Eleanor Oliphant Is Completely Fine

[Michele]

I'm Thinking of Ending Things

[Rainbowheart]

Small Spaces

[CraftyChara]

Please Ignore Vera Dietz
When Marnie Was There
We Were Liars
Liar

[rory]

Every Last Word (this somewhat fits)