The evolution of Bijuu is divided into seven parts, 9 Tail Bijuu, Arch Bijuu, Bijuu Monarch, Bijuu God, True Bijuu, Supreme Bijuu, Bijuu Progenitor.
9 TAIL BIJUU- This is the lowest ranking Bijuu that has 1 to 9 tails, the example of this type of bijuu is the tail beast in the Naruto series. The strength of 9 tail Bijuu can destroy a village in a single attack and they can destroy the world in a month.
Arch Bijuu- This type of Bijuu was above 9 Tail Bijuu and stronger, this Bijuu has 10 to 100 tails the number of the tail will determine by the amount of their Chakra, The smallest size of this monster is 1 km and the largest is around 100 km, this Tailed Beast devoured worlds and destroyer of star in a single attack. their Tailed Beast Bomb can rival an explosion of a Super Nova also known as the explosion of a star.
Bijuu Monarch- A Bijuu that ruled over the lower level Bijuus such as 9 Tail Bijuu and Arch Bijuu, this Beast has an average size of 1,000 light years and this beast has the power to destroy a whole galaxy in a single attack, and if this tailed beast releases his/her strongest tail beast bomb. This Beast has a tail of 101 to 1000 and its body size reaches 100,000 light year
Bijuu God- A bijuu that has the power to create, control, and destroy Realms, their strength is equal to 13-level existence. The body size of this beat is infinite and has an infinite number of the tail that has a length of true infinite.
True Bijuu- This Bijuu has the power and ability equal to Medieval-level True God/True Medieval God. This Bijuu has a body size of true infinite, and its tale was combined into 10 large tails and this tails has a length beyond infinite.
Supreme Bijuu- A Bijuu that has the power and ability equal to the True Primordial God. This beast has 11 to 100 tails with a body size beyond infinite and the length of its tail is Unknown
Bijuu Progenitor- A Bijuu that reaches strength and power equal to a God Of All.
This Bijuu has an unknown number of tails with a body size of unknown and the length of its tail is unknown.