Rank
From GRAY RAVENS
Each playable character has a default Rank that they will be at when obtained. In addition to this, they can also evolve with enough Inver-Shards, causing their Rank to increase and their stats to rise. With each Rank beyond S-Rank, characters gain access to more Skills.
B-Rank
This Rank is available only to three characters at the beginning of the game. There is no way to guarantee B-Rank characters from R&D banners.
Any time a duplicate B-Rank character is pulled from R&D banner, they will be converted into 6 Inver-Shards.
