Pyromaniac - I think this kit if fine for as it is, you get a Chain Chestplate (Fire Protection V), Flint and Steel and Lava Bucket. Yet the kit doesn't get used often, I think adding a full set of Chain Armour might make this more attractive.
Lumberjack - This kit gives you a Stone Axe and 10 Oak Logs, (40 Wooden Planks) making this a perfect kit to rush with super fast, but I believe it's the weapon that makes this kit bad, I mean just a Stone Axe? I suggest replacing the Stone Axe with an Iron Axe.
Archer - This kit is good, it gives a bow with 10 arrows making sure you can kill someone right at the begin if you're fast enough. But you can literally get a bow in any chest! To balance this kit I think you should get either a Power I or Power II bow with 15 arrows as a little extra.
Chicken - This kit barely gets used, even tho 64 Eggs can be dangerous when spamming it. To make this more attractive, possibly add Leather Armour like the Egg Shell Kit in EggWars.
Swordsman - No changes should be made, it gives you a strong sword you can't obtain in any chest giving you an advantage if the opponent doesn't have this sword.
Scout - Why would you want 3 Speed Potions to fight on small islands? It's rather dangerous then usefull, the Stone Sword also doesn't help that much. I suggest adding 2 more Speed Potions to the kit, and bugg the weapon.
Iron Golem - Shouldn't be changed. The Iron Helmet, Boots and Leggings are the 2nd best in the game after Diamond Gear making sure you can take hits. With some luck you get a decent weapon and you're ready to go.
Digger - An Iron Pickaxe with Unbreaking III and Efficiency II isn't the best. I'd rather get a Diamond Chestplate WITH a Diamond Pickaxe to make it a little bit more worth as a kit.
Spiderman: Cobwebs can be very dangerous, but it's not worthy as a kit itself. Possibly adding an extra item or weapon might help this kit.
Blacksmith: This kit is only good in OP SkyWars, I think it should receive a Diamond Helmet rather then a Chain Helmet and the Book of Enchanting (Protection I) should get buffed to Protection III to make better gear.
Fisherman - 5 Raw fish and a Fishing Rod... Fishing rods are easy to obtain, not to mention with 1.9 they became useless. I suggest removing this kit because even in 1.8 it's bad concidering you can get this item pretty easy.
Enchanter - This kit gives good value with 32 Lapiz, 64 Enchanting Bottles and an Enchanting Table. But I think giving this kit a bit of unenchanted armour to enchant (I suggest Chainmail or lower) could make it more usefull. Adding an Iron Sword to enchant wouldn't hurt either.
Bomber - This kit is not ment for TNT Boosting, yet it's used quite a lot lately. Possibly adding gear with Blast Protection makes it more loved as you can deal damadge with the TNT while your armour reduces damadge from TNT.
Joker - 1. Remove it, it gets 3 TNT, making this useless since the Bomber Kit outclasses this. A Wooden Sword is even more useless. 2. Change items: It does give you a potion of instant damadge wich has more possibilities. Removing all items and adding more Potions might make the kit better.
Redstone Master - Remove the hopper and add more (Sticky Pistons) so you can actually make better traps.
Lumberjack - This kit gives you a Stone Axe and 10 Oak Logs, (40 Wooden Planks) making this a perfect kit to rush with super fast, but I believe it's the weapon that makes this kit bad, I mean just a Stone Axe? I suggest replacing the Stone Axe with an Iron Axe.
Archer - This kit is good, it gives a bow with 10 arrows making sure you can kill someone right at the begin if you're fast enough. But you can literally get a bow in any chest! To balance this kit I think you should get either a Power I or Power II bow with 15 arrows as a little extra.
Chicken - This kit barely gets used, even tho 64 Eggs can be dangerous when spamming it. To make this more attractive, possibly add Leather Armour like the Egg Shell Kit in EggWars.
Swordsman - No changes should be made, it gives you a strong sword you can't obtain in any chest giving you an advantage if the opponent doesn't have this sword.
Scout - Why would you want 3 Speed Potions to fight on small islands? It's rather dangerous then usefull, the Stone Sword also doesn't help that much. I suggest adding 2 more Speed Potions to the kit, and bugg the weapon.
Iron Golem - Shouldn't be changed. The Iron Helmet, Boots and Leggings are the 2nd best in the game after Diamond Gear making sure you can take hits. With some luck you get a decent weapon and you're ready to go.
Digger - An Iron Pickaxe with Unbreaking III and Efficiency II isn't the best. I'd rather get a Diamond Chestplate WITH a Diamond Pickaxe to make it a little bit more worth as a kit.
Spiderman: Cobwebs can be very dangerous, but it's not worthy as a kit itself. Possibly adding an extra item or weapon might help this kit.
Blacksmith: This kit is only good in OP SkyWars, I think it should receive a Diamond Helmet rather then a Chain Helmet and the Book of Enchanting (Protection I) should get buffed to Protection III to make better gear.
Fisherman - 5 Raw fish and a Fishing Rod... Fishing rods are easy to obtain, not to mention with 1.9 they became useless. I suggest removing this kit because even in 1.8 it's bad concidering you can get this item pretty easy.
Enchanter - This kit gives good value with 32 Lapiz, 64 Enchanting Bottles and an Enchanting Table. But I think giving this kit a bit of unenchanted armour to enchant (I suggest Chainmail or lower) could make it more usefull. Adding an Iron Sword to enchant wouldn't hurt either.
Bomber - This kit is not ment for TNT Boosting, yet it's used quite a lot lately. Possibly adding gear with Blast Protection makes it more loved as you can deal damadge with the TNT while your armour reduces damadge from TNT.
Joker - 1. Remove it, it gets 3 TNT, making this useless since the Bomber Kit outclasses this. A Wooden Sword is even more useless. 2. Change items: It does give you a potion of instant damadge wich has more possibilities. Removing all items and adding more Potions might make the kit better.
Redstone Master - Remove the hopper and add more (Sticky Pistons) so you can actually make better traps.