I'm looking for some good fics to read in which an elf is revealed to have a secret identity.

E.g. what if Lindir turned out to be Elured? Or Erestor was, in fact, Maglor? Or Melpomaen was, Oh I don't know, Elrond's long lost lovechild or something? :P

Can anyone help?

super late, but i did this story that fits your criteria

http://azzy.livejournal.com/tag/star+of+the+sea

Almost two years two late but this topic might still be interesting to somebody :

Warning: Morgana's Website and Stories are not NSFW.

Avenging Angels by Morgana
http://www.paranoid.nl/avalon/angels.html
Erestor/Haldir . Erestor/Glorfindel
Haldir uses Erestor and not only Glorfindel is set on extracting revenge.

Coming Home by Morgana
http://www.paranoid.nl/avalon/cominghome.1.html
Glorfindel/Erestor and Elrond/Celebrían
Imladris’ newest addition proves to be a handful and quite a mystery

Erestor of Imladris by Morgana
http://www.paranoid.nl/avalon/erestorofimladris.html
Erestor/Glorfindel
Erestor and Glorfindel stay with the twins who made the choice to be mortal until their dying day. Standing at their funeral pyres, Erestor makes a startling admission, which leaves Glorfindel completely shocked. Now that the twins have died, Erestor is finally free to admit the truth and mourn the family he never had.

The Inside the Painting Series by Morgana
Inside the Painting
http://www.paranoid.nl/avalon/inside.html
Erestor/Maglor
A painting mysteriously appears in Erestor’s rooms and with it, an adventure starts for the Chief Advisor.
Letting Go
http://www.paranoid.nl/avalon/lettinggo.html
Erestor/Maglor and Elrond/Glorfindel
Maglor tries to settle into his new life and Glorfindel tries his luck with Elrond
Twins
http://www.paranoid.nl/avalon/twins.html
Elladan/OMC (Bevyn) and Elrohir/OMC (Brys)
On their way back from the Golden Wood, Elladan and Elrohir encounter a pair of twins in need.
Sharing Beds
http://www.paranoid.nl/avalon/sharingbeds.html
Elladan/Bevyn, Elrohir/Brys, Erestor/Maglor and Elrond/Glorfindel
Elladan and Elrohir arrive in Imladris with their charges. Maglor realizes his feelings for Erestor and Elrond finds his heart opens up faster to Glorfindel than he thought possible.
Answers
http://www.paranoid.nl/avalon/answers.html
Elladan/Bevyn, Elrohir/Brys, Erestor/Maglor and Elrond/Glorfindel
Elladan takes care of Bevyn, Elrohir tries to support Brys, Glorfindel recuperates and Maglor get his wicked way with Erestor.
The Greatest Secret of Them All
http://www.paranoid.nl/avalon/greatestsecret.html
Elladan/Bevyn, Elrohir/Brys, Erestor/Maglor and Elrond/Glorfindel
Bevyn and Brys find out who they really are and they continue to recover.
Brys
http://www.paranoid.nl/avalon/brys.html
Elrohir/Brys
Brys faces his painful past and accepts that he is loved.

And A Star Came to Imladris by Morgana
http://www.paranoid.nl/avalon/star.html
Erestor/Glorfindel
A drained Elf arrives in Imladris carrying a precious charge with him. Glorfindel, being Glorfindel, reaches out to them

Beautiful by Morgana
http://www.paranoid.nl/avalon/beautiful.html
Elrond/Erestor and Erestor/Elrond/Glorfindel
Glorfindel is lonely because Elrond and Erestor are lovers. Once Elrond learns of a painful event in Erestor’s life in Gondolin, the half-Elf takes charge.

Gildor's Diary by kasura
http://www.fanfiction.net/s/1574904/1/bGildor_bs_Diary
Gildor's account of his relatives' vicarious lifestyles. Major OCC, slash hints
Note: Included for this line amongst others , "What's next on the dirty family secret list I wonder? Miriel was really Olwe in disguise?"

Okay. I think that's enough fic for a request two years old.

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I think I love you, LadyBrooke. Some of the websites you linked I once had bookmarked before my harddrive killed itself. Thaaaank you. Lots of reading ahead for me!