I have been thinking a while and I personaly think that AT charecters could easily be LOST charecters.

Finn would be Jack

Jake would be Jin

PB could be Kate

FP would be Juliet

LR would be Sun

Ice King would be Hurley

Betty would be Libby

Peppermint butler would be John Locke

That is all I can really think of for now.Please feel free to add any more