When all you have is a hammer, everything looks like a nail. This show was not about feminism.

Spoilers

Kino takes her name from the man who is killed with the name and becomes so androgynous it's a running mystery until late in the show if the new Kino is actually a man or woman. If you define feminist friendly as destroying the genders then yeah Kino would be that if that's all you want out of it.

Kino's travels is more in line with gulliver's travels than a poke at the 'patriarchal power structure'. It includes, but not limited to child like views of paradoxes of the world. There are women both strong and weak, free and slaves, independant and subserviant in the show. It was more objectivist or zen like rather than trying to apply any sort of double plus good words that can be found.

Characters also wanted to serve Kino as a functioning family and were denied afterwhich they commit suicide. Although I wonder if that isn't part of the appeal of the feminist friendly label. Others were going to dominate Kino regardless of gender because they were tyrants to their people, slavers, or a desperate people looking to kill for revenge. The characters were equal opportunity in their dispensing of cruelty to both men and women alike.

So one wonders how you can make the leap of logic required to say she endures sexism. It is never explicit or implied about sexism to Kino. That must be quite some leap since they don't even reference her gender until a flashback at almost the end of the series. So please put the hammer down.