No worries, Spree! (btw, random factoid, "bel-esprit" was dictionary.com's word of the day today. 🙂 (dictionary.com is not affiliated with TLC, etc.))

In my head, I carry a map -
an excellent one at that -
but though it wasn't faulty,
sorely lost became my party.
Who am I?

Peter?

Nope.

Could it be Puddlegum? Or Trumpkin? I have a feeling it's one of those two...

Neither, but you're closer with Trumpkin.

It can't be Lucy? She didn't carry a map in her head because she had something in it...

No, not Lucy, even though she knew the way better than the others in the long run. 😉

Oh. Is it Nikabrik?
I know it's one of the dwarfs, but I can't remember which one!

Nope, not a dwarf. But he once was mistaken as one.

Uhhhh... Edmund?

Indeed, Berry. 🙂

Oh. Really?
Hmm...so my instinct was half-right...

The problem with this game is that you can only trust your instinct half of the time and you don't know which "half-of-the-time" to trust it. 🙂

*chuckles* Very true
There's a weird voice inside my head that keeps saying that it's Trufflehunter, but I don't think that's right.

No, it's not. Berry got it with Edmund.