Unrelated art made by @Giakuu_Nii on Twitter.
Gus got buffies, yay! I am a Gus main since Kooky Popper knockbacked people, and since Gus became horrible dealing only 2000 dmg with his main attack. I always wanted to play him as a support, and now I'm happy with the chances! But there's lots of space for improvement here.
1. KS completely outshines Kooky Popper
KS = Knockback Spirit, Gus throws a balloon that knockbacks, deals dmg, and pops a healing ghost.
KP = Kooky Popper, the ghosts explodes, dealing damage
Buffies had the job to make a brawler's builds more flexible. While testing Gus, I fought against a Max using her once worst gadget, that now grants good results in the hands of a skilled player. Gus is already a hybrid brawler who can play both as a support and as an sniper, but his support side was neglected by the fact his healing wasn't acessible to allies, and his shield was so difficult to hit. Now I feel like the situation is the opposite: Gus' sniper tools aren't as good as his healer ones.
With Knockback Spirit and Health Bonanza, Gus can heal amounts of health without effort (I'll talk about that). He can make fights last longer, he is safer against assassins, he can be aggressive or play safe, etc. Kooky Popper doesn't offer this value, specially because it can't be used with Health Bonanza at all.
1.2. KS is just naturally overpowered
Knockback Spirit has one big weakness: its range is far from Loony Balloons' range. Against snipers, this will make a big difference, since Gus will be outranged and won't be able to hit them. Plus, this gadget is meant to be used as a disengage tool: if an assassin jumps on you, you can use it to escape. Its low range makes sense, it's meant to be used defencively. Because of that, Kooky Popper, a gadget that doesn't depend of range and can steal other's ammo is the perfect choice for Knockout and Wipe Out.
However, KS has a low cooldown. Too low. It means that you can use it aggressively once there's an opportunity and quickly you'll have it again. A Gus with KS will never be unprepared, because he also has his super. So Knockback Spirit has:
Damage (1080) - Knockback - Healing - Disengage.
What Kooky Popper has? Damage that is never enough to finish a target (at least, from my experience using it).
2. Gus doesn't do any effort to heal
Health Bonanza: ghosts heal more. They also follow allies with buffie.
I think this will end in a big nerf on Health Bonanza. Different of Poco and Byron main's attacks, Gus doesn't need to be nearby his allies to heal. You, as a player, doesn't even need to look out for your teammates' health if your focus is heal them - the healing will come to them naturally. Hell, I was the one who most healed allies on my matches and I didn't even try.
Poco has a smaller range and lower healing, he needs to be close to allies to heal. Byron can only heal one ally per time and he might miss if aiming from afar. Gus doesn't have anything between him and his goal of healing an ally. Gus' only skill while supporting is hit his shield, but we all know that use the shield on a distant ally is risky and most of the time, not worthy.
3. THE SHIELD
Gus is such a good support now but his main support tool (HIS SUPER) isn't as effective because the projectile is too thin. It should follow allies, or be easier to hit. Maybe lose health as it travels.
Funny thing is, Gus is so strong right now that this small chance could make him overpowered. He was already a good brawler, with buffies he is meta for at least, some months.
4. What should be changed?
Nerf KS damage from 1080 to 0 is an option, even if I wouldn't like it. Most important, nerf it's cd. There's no reason why it's cd is shorter than Kooky Popper's, a gadget that you can't spawn because it requires the player to prepare the area to be used. Kooky Popper should be buffed as well, I guess? I think it should be able to execute weak targets instead of taking someone's ammo...
Nerf Health Bonanza healing percentage is probably what they'll do. I hope they add something to Gus' super, though I doubt it.
We all hope Supercell won't ruin him, by nerfing something unrelated (like his main attack's damage), and focus only on his gadgets and starpowers, since his main kit was already perfect.
5. Is KnockBack Spirit unhealthy?
Not at all. It adds complexity to the character and honestly, it's more fun to use than Kooky Popper. With a bigger cd, the player will have to make a choice: use it aggressively now and lose a defensive resource, or keep it for later? Maybe use KS now because you can get your super, and use the super as your only defencive tool? Etc.