Gran is one of the most accessible characters in GBVSR. His moveset is pretty straightforward and still effective. You can pick him up, skip thorough practice and quickly move to having fun.
But of course, just a little time to get to know the character better will be greatly beneficial. Diaphone, a fighting esports professional and a content creator, has published a new video on his YouTube channel, explaining how to play Gran in Granblue Fantasy Versus: Rising.
Diaphone gives info on how Gran works and shows combos with him. Why not take a look?