Akira is a rather new one, but you should all be pretty familiar with her.
Akira has been travelling with Xecir ever since he came back to life. Which is good, since she was the one who gave Xecir his life back.
That's right. Akira is Death. And she's been running with Xecir to every world imaginable.
You know how Deadpool fell in love with Death in his comics? It's the same with these two, just without the insanity.