Yu☆Gi☆Oh! 5D's, Darling in the FranXX Recommendations
Both series involve the future, especially an post apocalyptic one (though for 5Ds, it was more of an alternate future).
Both MCs really have a strong resolve as a character, but were often held back by their own self-doubts. They also both have a big friend circle, as well as have had involvement with security guards/police in one way or another.
In both worlds, technology-related transportation means everything to the people in their respective series. In 5Ds, Riding Duels mean so much in terms of pride and freedom, while in Darling in the FranXX, having the ability to ride a mecha means everything to the young kids;
There are quite a few characters in Yugioh 5D's who are obviously heavily influenced by, if not complete copies of, characters from Darling in the FranXX(the most notable example being are Yusei and Aki, who are both similar to Hiro and Zero Two). Also, both happen to have similar styles of complex characters, and the plot of the story is slightly similar They both share one thing in commen and that is the post-apocalyptic mayhem started by the villains of Season from 5d's (Earthbound Immortals), while Darkling in the FranXX (Those Kaiju looking Dinosaur) Set in a future type of world with darker moments and