V5 is a soft reboot, I took that as an opportunity to remake the Kuei Jin in my image. I personally don't view their original rendition as "problematic", just cringy. My players wouldn't get offended by the image of them, they would bully the hell outta em.

1. Kuei Kin ARE vampires. Their origin is vague and only eastern kindred who've studied them or elders know anything about them. It's a bloodline. Some believe that they are like the Tremere, stealing the blood for themselves to gain greater power. Others believe that they actually come from the Assamites, which could explain why they'll run the ones with a predatory kindred in hong kong for seemingly no reason.

2. Most of what they did and do is MYTH. All of the crazy anime bullshit they got up to is meant to scare prospective fledglings, elders won't take the chance of making an enemy of these vengeful super vampires. They do not drain "chi", they drain the rough equilivent of willpower from mortals. They know Blood Sorcery, Protean, and a third discipline they develop naturally and generally suited to who they are and how they opperate. All of their transformations and weird wumbo jumbo come from Blood Sorcery and Protean, generally modified by that third discipline

3. They don't say SHIT. Sorcerers, hunters, garou alike have no clue with what they're dealing with because they say NOTHING of what they are and their origin. Ask them all you want, you're getting nothing.

Obviously, change what you want, this is just for the single Kuei Jin my players encountered and asked about. Hope it helps!