I've been breaking my head over this for some time now..
here's the description i remember, i think it was an horror anime movie from time somewhere between 1990. and 2000., i was a kid then..
Somewhere in the future, there were spaceships and stuff..
There was a female, who had some power(don't remember how she got it), it would change her skin and hair color to darker, and was stronger,etc..
I also remember that there were a brother and a sister who wanted to get that power from her. The brother was a commander/leader of the troops who were capturing the girl, and the sister was obsessed by the brother, and was furious why the brother doesn't love her (sexually i think.. what to say.. anime!).
I also remember that in the end, a spaceship/battleship they were on got destroyed, and the sister somehow got the power from the girl and made a sphere like "thing" and trapped the brother and they went into space, and then she "fused" with him, so they would be together always..
I also remember a scene where the girl was flying a jet plane, and crashed, and then she couldn't start the plane, so the power she had kinda,how to describe.., let a tentacle like hand and manually rotated the jet on a fighter jet, so the plane could lift of..
I know it all sounds messed up, but i just don't remember the name of the anime, any name of the characters, nothing.. i tried to google it, search on youtube with tags, but nothing...