Granblue fantasy

If a work explicitly emphasizes the Japanese cultural space, the use of *chan* and *kun* is logical.

You might be able to launch GBF and think that it features an original fictional world, and therefore it doesn't belong to that cultural space, but that's not entirely true. The characters' behavior, their ways of interacting with each other, and other elements are largely based on Japanese culture, and localizing these moments is like replacing *onigiri* with a donut because the translators see the audience or reader as an idiot who needs to be held by the hand and spoon-fed, as otherwise they won't understand what's being discussed.