Master level was the initial max rank per character. Now, there’re “Grand Master” levels on top of Master that require even more XP to rank up. There’s 4 Grand Master levels to work through before reaching your final level... Once you reach this final level, your character is max rank at Grand Master 5. Hope this makes sense.
According to developers’ livestreams, max rank could be adjusted again (to be higher), if the developers choose to do so (later).
@OB1-The-Only-One In order, the promotions are Advanced, Specialist, Elite, Super Elite and Master! Then, there are 5 promotions of Grandmaster after this, after levelling up through 5 Grandmaster promotions, you'll reach Grandmaster Rank 5, which is currently the maximum levels for all characters. You don't get any particular benefits by levelling up your characters past Master, except for boasting purposes, I suppose! But, you could use characters you really like for longer without already having them maxed out in levels!
The same levelling up system should apply when new characters are released (or possibly change slightly)! 👍
