JKSManga
It makes no sense why they are limiting the selection to only humans. Almost all those turned by Quinn have learned Qi and have a lot of it, Layla for one has the Qi from her mother who was a top member of Pure. Then there is also Erin and even Nate they both learned Qi. Only have enough Qi is a requirement while vampires tend to have less room due to their blood aura they can still have lot of Qi when trained in it more then a untrained human at that.
Thanks for being willing to update over the holidays, I really appreciate it. Sil is at the top of my list Followed by Shiro and that guy I think he was called Chuck, he used to watch over Sil when Quinn was a teacher. and while Nate is a vampire Quinn tasked him with teaching Qi to the people in his cursed faction. so Nate has probably got a good student or two.
I suppose Sil would be the best option but I wouldn't be surprised if the other king chose Quinn considering how powerful he is plus to be honest if it ends up being Ray's Noir, then it would be quite poetic that he ended up with Richard's Boneclaw and Ray's Wolf ( or what ever she may have eventually evolved into if Ray continued to feed her in MDS).
Idk when Ovin referred to the 4th king as fat I got panda vibes lol just putting it out there I think a Panda would be perfect also thinking of strong humans with just got to read about most of them so I’d say it’s got to be between Sil,Logan,Mona,Owen,Grim, or the guy following sera as they are the strongest humans not involving pure I feel there are probably some other ristrrictions to sera contracting as he is a god