the reason behind the purple hair of admiral huldo

[deleted]

Absolutely. It was no accident.

IMHO it was just so she looked alienlike. And coloring her hair is an easy way.

Please, use the proper term: her name is "Admiral Gender Studies" ^^

And, of course, she was not following proper military clothing regulations.

Psychologically purple can mean power, seduction, conceit, mystery, etc.

Example:

"In Anime purple-haired characters are often associated with innate power. These characters can be natural leaders, like Yuri Nakamura from Angel Beats or royalty, like Prince Soma from Black Butler. " [Source: https://www.quora.com/What-does-purple-hair-mean ]

Was she in a relationship with Leia? Their goodbye was made to be more profound than necessary as if they were an item, which would of course add to the feminist angle.

In nature, highly poisonous snakes, frogs, toads and insects will always feature bright, unnatural colours such as red, blue, pink, or PURPLE. This is nature's way of warning other creatures to stay away from their toxicity.