MC  centuries ago gets reincarnated into a cultivation world with Daily sign-in system. He reached the peak of the world with after gaining two character templates Yan Sen from Cultivator Against Hero Society  and Yogiri Takatou from Instant Death. Even with just less than half percentage on Character templates, he reached pinnacle of the world, so becoming bored jumped to a different world, while sealing majority of his powers, so not too destroy the new world he entered.Thus he reached the Douluo Dalu world.

1) Sea Dragon Douluo, Hai Long had Gyarados and his mega form in last soul skills 


2) Seahorse Douluo, Ou Ya either Kingdra with concept megaform or image in comments.


3) Sea Lance Douluo, Lu Young. Weapon of Poseidon from Anime Records of Ragnarok.


4) Sea Illusion Douluo, concept image of Arbok and concept megaform.


5) Sea Ghost Douluo, Dragapult pokemon with concept megaform.


6) Sea Star Douluo, Sta ra his soul spirit is Starmie  with concept megaform.


flute from Mo Dao Zu Shi Donghua. But with more illusion and water oriented powers.


Last we have Xiao Bai (Demon Spirit White Shark). She is changed to Sharkcrash from Beyblade anime


Chapter 27 - Notice