This is a very interesting question Celia...
Acting is a very fine art, especially for ballet, you have to do enough of it for it to be seen in the very last row, but you can't do too much, otherwise it will just look fake and overdone. Also you have to be able to blend technique and acting together, that's another fine line. You can not just forget about your character when ballet steps comes along. Probably one of the hardest moment in ballet is in Giselle Act 1. When Giselle comes out of her house and meet with Albrecht. It is all choreographed, and it is suppose to look like a real conversation, except it's not, you have steps to do on a particular music. That entire scene is a real challenge for any dancer...it's a real test of talents...I can't stand when you see dancers doing the ballottes kicking their legs high, that scene is all about being gentle...they are dancers and should be able to lift their legs high anyway, but this is a really bad moment to show off...they have crossed the line that I was talking about !
I like to think that I become a character, but that would be wrong, because Romeo, Albrecht or Siegfried are not dancers, I mean they would never act the way we have to...so what I like to do is put myself in their shoes, and look like them, move like them, think like them...but staying myself, and try to find my own emotions to feel the way they would feel at any given time. When I am Romeo, I am totaly in love with Juliet, whoever Juliet would be...with Evelyn, we shared some wonderful moments on stage, it's easy to forget that you're performing sometimes, especialy Romeo, because you go through so much emotions in 3 hours...And I know that I feel every one of them ; the passion with Juliet, the hate for Tybalt, the anger with the death of mercutio, then the loss in the crypt, and the terrible decisions that you are facing.
I think it's the best way to transcend acting...you have to be natural, and believe in your character...how would I feel, what would I do...then maybe we will touch someone in the audience and transported them somewhere beautiful, somewhere they can always go back to with their memories.
Sorry I got a little carried away...I hope this answered your question Celia ?