I run on my Kihaku "Katsu Jinken", "Mokuso", "Kiai", and "Kusushi". I feel like this is the best build for him. Due to his high stamina costs, and allows for him to debuff the enemy when needed. Still recommend all speed.
Zimnyaya's "Small Propoganda" is still a good skill, and I feel like you should keep it. I feel like with precision it's monstrous, but that's just my opinion. If it isn't you preference I'd run "Quick Freeze", "Devastating Barrage", "Coldtober Revolution", and either "Frostletariat Uprising", or "Prisoner Of Ice". Main denier all speed, or main support all team speed. This is considering you have the Energy Mask, and Energizer Staff. However if not I'd recommend making him a support with 2 team speed, and a stamina rune.
I feel like for Xiron the Ruby (Assuming this is the one you're referring too) I'd run "Total Exhaustion", "Mineral Blood", "Ruby Explosion", and either "Ruby Implosion", or "Laying Odds". This would allow you to have deny options while you're random control skills aren't able to be used. Still recommend all speed.
Nadiel the Flooder I'd personally run "Nature Pact", "Insects Plague", "Paterswoldse", and either "Druzhby", or "Endangered Ecosystem". Still recommend all speed.
Not much thought about other deniers. I feel like most of them are fine with their current skill sets. Stuff like Hackster (Monsters with multiple deny options) aren't really effected by this change all that much. Hope this helps, any other monsters you need suggestions on for my opinion, just ask me.