So, what I'm reading into is that you're calling Kintoki a "basic bitch ass with a slightly-special-but-not-really NP". Am I right? Well, seems like he needs more upgrades, then.
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Let's be real here. If Charisma, the most basic bitch skill can get it's numerous upgrade variants for simply being "basic bitch skill" then clearly Kintoki needs a upgrades for all his skills.
EDIT: Like, you know what would be cool? If Kintoki's 1st skill also gave him a one-use, three turn timer that allows him to get 50% NP charge when he uses his NP. Isn't that amazing? He's now actually capable of doing long-term sustained damage or short term burst damage. Whilst it's still great to save for his NP turn, you don't need to if you're gonna go ham with triple Buster and need the edge to push your damage through to initiate next phase. Stuff like that can change how you play him and what your maximum damage potential can be.