This is the bio for Ryujin enjoy

Stats

Height 400 feet 

Weight 84,000 Metric Tons

length 800 feet  including tail

history: For his origins I won't go over his ogrins in Ryujin Battle Royale since it's still on going but I'll will go over his origins in the ancient past

He was the father of Goddess Otohime who married hunting prince Hoori. According to legend the 1st Japanese emperor was grandson of Otohime and Hoori. So Ryujin technically is part of Japanese Dyntasy. leading back with  600 B.C. and was envoled to present for. Example he help Empress Jinga in Invasion of Korea after her husband died and was appearently killed by someone from Korea. So ask Ryujin for some help so Ryujin for help so Ryujin gave her the jewel of the tides which can control water and did so wipe all her enemies when she invaded with the aid of Ryujin who was also appearently there to aid in battle. 

In 600 B.C. Then there was the fisherman of Urashima Taro sees children toturing a fish and tells them to get. Turns out the Fish was the daughter of Ryujin Toyotama-Hime also known as    Otohime. The fish thank him for his kindness then man live a little while she came back as a turtle unknown to Urashima Taro that it was same fish and ask him to get on his back. They went Under the Sea to the huge palace where Ryujin was greeted by him and invited Mr. Taro  to a grand feast with his daughter. The Man said sure then went go say thank you to turtle but the turtle disapeared. Then Ryujin Daughter Toyo went to Visit Mr. Taro. She later said "Do you remember me I am fish you saved I have something to show on the next full moon from now see you soon see you at dinner."  Man had a nice time at dinner and had grand feast like no other and sat right next to Ryujin and his daughter and got to know his daughter real well. Then his daughter ask Ryujin said if he could spend time with the man Ryujin said yes. His Daughter Spent time with Mr. Taro until the full moon they even grew feelings towards each other and even got to spend time with Ryujin. Then on the night of the full moon Ryujin ask if him would like to stay Mr. Taro he said yes. Then Otohime had something to show and told him meet him by the tree under the full moon. They confess there love under the tree for each other and kissed then She asked "not to look" he then "Um sure" then she transform into a White Dragon. Then He heard a branch behind him and he look saw that she too was dragon. She cried because he told he stun by her beauty as a dragon. She then told it's been 1 weeks and human 700 years and were stay for 3 days would of past 1,000 years would of past. He then said "I do miss home but I want to stay with you and Ryujin." She then said "You only stay for another week otherwise you die." Ok he stay the 3 days then when it was time to go home. Otohime asks Ryujin for the pearl of immortality  he then gives so she give as a gift to Mr. Taro. He then heads home but given a gift by Otohime a box. Then he heads and discovers 1,000 years have passed and everyone he knew has a long pass so goes back to the old home which is still there.  Then some villagers thief tries to steal the box they open it and 500 years past and his ages while it happens and dies. Otohime discovers that Cries Ryujin gets mad for his daughter crying punish the villagers by not given them water and wipes out the village.

Ryujin's Daughter Otohime fell ill so the doctors told him they need a monkey's leval. Son Wukong was fishing for some fishing when all of a sudden a jellyfish grab him from the tree and was fishing on the lake. Ryujin then invited him to a grand feast with food and drinks. Son Wukong ate and drank so much food and drinks that he passed out The jellyfish doctor told him Ryujin they needed Son Wukong lever intake Son Wukong over heard this. Then Ryujin told the guards to sober him up. Then Son Wukong beat up the guards and then went a tree where the jellyfish doctor was at then told leval don't grow on trees and left. Ryujin  got mad At The Jellyfish doctor then told him they still need a level then constructing one of his turtles knock him out. Then the jellyfish said we can proceed. Then her daughter came out ok

Ryujin, Toda and the Centipede: Ryujin ask Toda to help kill a giant centipede he said so Ryujin turn into a sword. He turn into a Katana  and went to go kill the Giant Centipede. A big fight happens with the giant centipede which ends with Toda killing the Giant centipede with the Ryujin sword. Ryujin turns back into and then rewards him with a bag of rice.

Ryujin's involment with wars since  700 B.C. except for World War 2 where he saw a vision that Japan was gonna got nuke and saw the stuff Japan would do. So he became a doctor during World War 2 and the Involemnt with Kaiju since 1933 till whenever Ryujin Battle Royale ends 

Abilities and Powers

Orange and Blue Plasma Breath: This breath is similar to power as Final Goji Blue Hyper Spiral Breath and destroy enemies really quick.

 Yellow and Red combine Lightning breath: similar to Godzilla Infinite Heat Ray in Godzilla vs.  Destoryah it can kill enemies. 

Black and Red Combine Lightning breath: 2nd Most powerful breath at most powerful it' similar to power as White Atomic Breath in Godzilla Wrath of the Hybrid at stanard

White and Blue Star Light beam: This is most powerful breath attack an most powerful can destroy everything if kept being used so Ryujin Choosely wisely when to use it. 

Red, Black and Yellow Electricity powers: Shocking enemies varies he kill you, Destroy everything around the enemy or destroy everything

Power of Madness and Light Mode: Similar to Kratos Power of hope but way stronger he can basically kill with this attack and is most powerful attack 

Transforming: He Can turn into anything like any animal, wethier be fish,Reptile,Mammal,Bird, bugs,marine animals, or Humans. But likes into Turtle, snakes, Dragons or Human    

The Pearls and Jewels: He Has many some can control time, the tides of the water, and Immortality and all associated with him.

 Swimming: He swims real good in the water and even fight under there.

Constricting Abilties: He can constrict in any of his dragons forms or snakes forms.

Physical cabilties: He can fight real good and has been doing it since the time of water came to earth and even brought water to earth. Able to fight in any environment on earth or planet and even survive deep space.

Durability: He Skin is like Armor do his scales being like Armor he can use his Wing like a shield

Insane Regenaration:  He can Regenarate in insanely fast after wounds he might take 

Soul Revive: He Can only Revive His Soul and People he Knows or in his family or people. Who pray or worship him.

Giving Good Luck: He can give you or others,his family and himself good luck if you pray or worship him.

Immortality: He Immortal he can't die

Water Cabilities: He can control water of any kind

Storm Cabilities: He can Create storms 

Fire Cabilties: He can breath normal fire but choose to use Orange and Blue Plasma and can use fire 

Lightning Cabilities:  He can control lighting 

Earth Cabilities: He can bend the land with water moves rock

Wind Cabilities: He Can control the wind

Rain Cabilities: He can make Rain.

Tornadoes and Giant or Small WaterSpouts Cabilites: Yep he can create Tornadoes and Giant or Small Water Spouts Going EF0- EF7. Lucky he only does this in the water if does it on land people are screwed. 

Stars, Clouds, Night  and day Sky Cabilities: He can control the stars and Sky and clouds

Zyru Sword : Zyru can turn into a Sword and Help Ryujin but being used as a weapon 

 Ryujin Sword : He only done this once but can do it again but chooses not to unless right moment

Allies : 2nd Godzilla Showa and Heisei Godzilla combine, 3rd Godzilla  Anguirus, Rodan, Gorosaurus, Mothra Imagos and Larvas, Kumonga, King Kong, Titanosaurus, 2 Baragons, Varan, Manda, Noryumiko, Shimo, Kiryu, Zyru, Moguera 2, Guardian King Ghidorah,     

Enemies: Too many to list

Family and Friends : Too many to list

Weaknesses: None except destroy his heart but even that is hard because there's armor around it.  

Trivia: There are  shrines around everywhere in japan near water  just so you pay respects to Ryujin. But there are 4 big ones in Japan if you want to pay respects to him and family in person.

That's the end of the bio

https://youtu.be/Sd7BT_xo9Lo