Perhaps I should have clarified that in the OP. No, Changeling will not keeps its ability after copying a skill like Adrenaline, Momentum, or Immortal.
By the way folks, due to the awesome Art class ran by vrt and Pepo, Changeling has new art! I chose Kami's over the others mostly because it is how I expected Changeling to look. A weak, undefined creature that has yet to develop.

Thanks Kami!