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