Aside of Aramina which she is role by Summer in Barbie and the Three Musketeers. Who are other characters from the movie that Summer roles a character, who are they?

Well; we have a discussion about it in Summer's fanspot. So, Summer as doll appears in 2004, so, she can't appears in Nutcracker, Rapunzel and Swan lake. As far, as I know, Summer plays Brietta in MoP and Melody in DC (and Aramina, of course).
If you not sure about Brietta, I'll give you a prooflink.

Yes, Lola, your answer is right! I think the same :D