ITT, let's discuss one of the most crucial parts of the Major's character design: her hair.
As you know, it varies a lot both across the franchise and within certain works (sometimes even from one page to the next) both in texture and color, but I'm pretty sure that this, right here, is her very best, most definitive hairstyle. It's thick, shiny, floofy, and really encapsulates the blend of spunky, wild tomboyishness, sex appeal and femininity that defines her character. And when it's indigo-tinged it also carries across the idea that she's artificial and that she's a bit of a punk in spite of her job. A cyber-punk if you will.
Also, I'd like to point out that in the last chapter of the manga, we see that her residual self-image (as they say in The Matrix) still has this hairstyle.
If I were to rank her various hairstyles I'd say:
this one > movie > SAC > slicker one from the manga >>>>>>>>>>>>>>>>> 2017 > Arise.