Your threads title is incorrect, Samurai hate Ninjas

Dat concept.

Ninja were rogue/mercenary units hired where the honor of a samurai would be compromised if assigned the same task. Ninja were rarely armed with more than a couple knives and throwing weapons, maybe three or four total; their goal was to kill one person, not storm a homestead. Ninja who were previously samurai had competence in swordplay but lacked the armor they once used in exchange for more mobility and quiet movement. Ninja were not honorable warriors. Ninja were not socially respected. Ninja were mercenaries for the highest bidder. Being a ninja often meant giving up any form of social life or living a double life, assassinating to pay debts as an innocent civilian during the day. Ninja often carried out assignments at night to use the cover of darkness combined with dark garbs to avoid encounters with guards or witnesses.

"Everyone loves ninjas"

That only applies to "modern" medial concepts of ninja. The truth is they were hated by everyone, though their family might tolerate them if it runs in the family; if not then they shame the family and are outcasted. To simplify, only ninja even tolerated other ninja; normally everyone else would try to kill them on sight.

Ignoring the cliche and obnoxious regards to ninja in this thread, your proposed armor requires more specific detail; how much is "some brute defense"? How many defense bars is that? What star rank are these? How much defense do they have to begin with? How much attack speed, damage, or movement speed comes from a single part, and which part gives which bonus? Keep in mind balancing will be applied by the community on behalf of myself and/or others, hopefully by several users, addressing issues with what you provide. If you want others to do this for you because of laziness and/or neglect then move this thread to the graveyard. If you are willing to put forward effort and accept balance is a requirement and not an option then please continue.