I like how Tiga and Dyna contrast each other
Tiga has darker colors he feels very mysterious and reserved on how he acts
Dyna is way brighter more reckless all his stuff is flashier
It's not only a cool contrast but it even reflects their themes/characters pretty well
If I had a nickel for every time a shonen series had a main cast made up of a group of 5 guys from different nationalities that included the main character being Japanese and looking for a lost relative and a green Chinese dragon guy and a Russian guy