Why ryu and jin are in the game is because the game is meant to resemble both street fighter x tekken/tekken x street fighter (only with D.C and marvel characters instead) and ryu as well as jin were put in it because in honour of those 2 games for this 1 game.
D.C Comics X Marvel Comics Characters
D.C/Marvel
1-Batman/Wolverine
2-Superman/Spiderman
3-Wonder Woman/Captain America
4-Flash/Iron Man
5-Green Lanturn/Incredible Hulk
6-Martian Manhunter/Thor
7-Hawkman/Hawkeye
8-Aquaman/Ant-Man
9-Green Arrow/Wasp
10-Red Tornado/Thing
Secret-Blue Beetle/Silver Surfer
Secret-Black Canary/Daredevil
Dlc-Ryu/Jin Kazama
P.S
Why ryu and jin are in the game is because the game is meant to resemble both street fighter x tekken/tekken x street fighter (only with D.C and marvel characters instead) and ryu as well as jin were put in it because in honour of those 2 games for this 1 game.