Bankai Idea

 Flame Bankai (Yamamoto) 

Z - Straight Punch > 16 seconds 80x Strength

Make your body had big muscles and stand and possesses wind and charge your two fist and teleport to the enemy and punch him/her causing damage and knockback

X - Blade of flames > 18 seconds 65x Sword

Make your sword like had a flame aura then make a big fire around you and all that got hit take 5 seconds tick damage

C - Flame Wall Attack > 26 seconds 90x Chakra

Make a wall made of flame and block attacks for 7 seconds and make your sword had flame aura then slash the enemy near you and the enemy take damage, tick damage and stun for 5 seconds and make 5 flame sphere and throw it on enemy

 Blade Bankai (Byakuya) 

 Z - Multiple Blade > 12 seconds 45x Sword 

Drop your sword and if it hits the land numerous blade will attack the enemy (auto track)

 X - Thousand Blades Unite > 29 seconds 120x Sword 

Drop your sword and if it hits the land numerous blade will attack the enemy (auto track) and if the enemy got hit the sword will scatter and unit and damage the enemy for 9 seconds

C - Blade Defense, Attack and Pattern > 30 seconds 85x Sword

Drop your sword and if it hits the land numerous blade will make a pattern like a shield that block all attack for 10 seconds and attack the enemy

 Ice Bankai (Rukia) 

 Z - 0 Degree > 20 seconds 170x Chakra 

Makes all player around you stun and be iced for 12 seconds

X - Ice Mist Pillar > 25 seconds 65x Chakra

Flow into the air and summon a big pillar of ice with mist and if the enemy got hit he/she will take tick damage and stun for 15 seconds

C - Ultimate Freeze > 35 seconds 90x Chakra

Stun all player around you for 20 seconds

Light and Dark Bankai (Aizen)