If Kito accepts people food, why not try to convert him to a raw/barf diet?

Other wise, switch to 2 meal times a day, after 15 minutes if he has stopped eating, pick up and put away any remaning food in the bowl, and say tough nuggets until supper time. And then repeat the same process if he does not finish or eat his supper.
And remove ALL treats during the day. No more treats until he gets back on a regular feeding schedule.

If Kito is not sick, that's exactly what he thinks "meh, I'll just eat later whenever I feel like it." or... "I'll just hold out for treats, if i don't eat my supper she'll just give me more treats and human food."