Just some suggestions
Assassin-
crossbow
arrow of poison x4
arrow of slowness x4
note: idk if the arrows would be overpowered but I think decreasing the amount would balance that out
Engineer-
dispenser x5
tnt x4
arrow x4
fire charge x4
lever x3
red stone dust x30
note: I know its not very practical but it seems like it would be fun to use
Summoner-
skeleton spawn egg x2
creeper spawn egg x2
zombie spawn egg x5
Wizard-
splash potion of regeneration x1
splash potion of strength x1
splash potion of poison x1
splash potion of weakness x1
note: I think this kit would work with any 2 good 2 bad potion effect combo
Ghast-
fire charge x6
elytra or 2 or 3 slow falling potions
note: This one only really works if fire charges can be thrown. If the elytra is too op replacing with slow falling potions helps balance that out
Assassin-
crossbow
arrow of poison x4
arrow of slowness x4
note: idk if the arrows would be overpowered but I think decreasing the amount would balance that out
Engineer-
dispenser x5
tnt x4
arrow x4
fire charge x4
lever x3
red stone dust x30
note: I know its not very practical but it seems like it would be fun to use
Summoner-
skeleton spawn egg x2
creeper spawn egg x2
zombie spawn egg x5
Wizard-
splash potion of regeneration x1
splash potion of strength x1
splash potion of poison x1
splash potion of weakness x1
note: I think this kit would work with any 2 good 2 bad potion effect combo
Ghast-
fire charge x6
elytra or 2 or 3 slow falling potions
note: This one only really works if fire charges can be thrown. If the elytra is too op replacing with slow falling potions helps balance that out
