So I find the bloodlust trait to be an interesting idea. Playing with Brita's weapon mods, it's basically impossible to not gain this trait lol.

However, it's kind of just an annoying chore when it has literally zero benefits. When playing solo, it makes it extremely annoying to get things done at home, especially if you've holed up in the country. Given the description of the trait, this makes sense! But from a gameplay perspective, it's just kind of annoying to have to deal with a purely detrimental trait every single game given my playstyle.

Realistically (while bloodlust in general being guaranteed if you're slaughtering large amounts of zombies is kind of unrealistic, which I could go in depth about psychologically, but to keep in simple, just take a look at the guys today and in history [special forces, executioners, scout-snipers, even regular soldiers sometimes] that stack bodies literally every day, some having killed hundreds of people, yet pretty much none of them gain some insatiable urge to keep killing, and they certainly don't go stir crazy from not killing people lol ; BUT IT'S A GAME WHO CARES it's a fun and interesting trait) sating your bloodlust wouldn't simply make you not depressed/angry/anxious/etc., it would make you /happy/. You wouldn't just feel normal from killing, you'd feel /better/.

Essentially, I propose the bloodlust trait to be modified to give the player a kind of "high" (as in a benefit or bonus) for killing, which could increase up to a certain point the more they kill within a specified period of time.
For example, it might be interesting if killing gave the player a similar effect to adrenaline, where they could more easily ignore any wounds or pain they might have, and gain some small to medium bonuses in strength and/or speed.
They could also or alternatively gain a kind of "Bloodlust: ecstatic" moodle where "wawa weewa you feel real gudz because ya been killin tonz of zombiez :DDD" or something.
Maybe the character could gain some sort of thrill of the hunt, where they gain a sort of hyper-focus on killing, increasing their perception radius and hearing range, letting them find more "victims".

These are just my ideas to make the bloodlust trait less of a fun-killer and more of a dynamic and balanced trait with both benefits and detrimental aspects.