If you want to rename a character, you need a name change coupon. It's $15 in the cash shop. It's expensive, so if you do decide to purchase one, use it on the character you plan to play the most.
Adding Frenzy to GMS was stupid. It'd be even more stupid to touch Frenzy at this point. People paid hundreds, if not thousands for the chance of getting one, and they would be furious if the item they invested so much to get was rendered worthless.
Is Frenzy unfair and it shouldn't gave been implemented into GMS? Yes. Would it be smart of Nexon to nerf it? Absolutely not. People paid for frenzy for a specific reason, and it'd be a horrendous business idea for Nexon to nerf it. It sets a precedent for other items to be nerfed as well. What's to stop them from nerfing Lucid's Earrings, Ring of Torment, or Breath of Divinity?
If Nexon really wants to nerf Frenzy totem, they'll need to buff universal spawn rates too. This way the whales keep their totem and reg players don't have to rely on spawn boosters as much.
As nice as it is to have kishin, it's hard to deny that it's harmful for the GMS meta. Kanna having permanent access to a spawn booster creates a meta where you need one in the same map as you if you want optimal rates is not okay. Fury/Wild is a nice addition, but it's ultimately a bandaid fix and their costs don't justify the short totem duration.
If nexon wants to really reduce the efficiency gap between classes, remove kishin's spawn boost and make the universal spawn for each map higher. This way you won't need Kanna to train optimally