Rank
Each playable character has a default Rank that they will be at when obtained. In addition to this, a character can also increase their Rank with enough Inver-Shards, through a process called Evolution. In addition to raising a character's Rank, Evolution causes a character's stats to rise. With each Rank beyond S-Rank, characters gain access to more Skills.
Note: Evolution does NOT change a character's Frame (ie. Liv: Eclipse can never Evolve into Liv: Lux as they are completely separate units).
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. It is possible to farm Inver-Shards for these characters in their respective Interlude Challenge Modes.
Any time a duplicate B-Rank character is pulled from R&D banner, they will be converted into 6 Inver-Shards. Inver-Shards for these characters are available from the Pain Cage Shop, but it is recommended to spend that currency on Inver-Shards for S-Rank characters instead.
To Evolve a B-Rank into an A-Rank, it takes 10 Inver-Shards.
B-Rank Omniframes
A-Rank
A-Rank characters are guaranteed every 10 pulls from R&D banners.
It is possible to farm Inver-Shards for these characters in their respective Interlude Challenge Modes. Inver-Shards for these characters are available from the Pain Cage Shop, but it is recommended to spend that currency on Inver-Shards for S-Rank characters instead.
Any time a duplicate A-Rank character is pulled from R&D banner, they will be converted into 18 Inver-Shards. To Evolve an A-Rank into an S-Rank, it takes 20 Inver-Shards.
A-Rank Omniframes
S-Rank
S-Rank characters are guaranteed every 60 pulls from Event R&D banners OR every 80 ~ 100 pulls from the Hypnos Limited R&D banner. New S-Rank characters have a 100% rate-up in their respective banners, but all reruns of that character have only a 70% rate-up.
At S-Rank, a character is capable of leveling up their Class Skill.
It is NOT possible to farm Inver-Shards for these characters in their respective Interlude Challenge Modes. 30 Inver-Shards for these characters are available from the Pain Cage Shop.
Any time a duplicate S-Rank character is pulled from R&D banner, they will be converted into 30 Inver-Shards. To Evolve an S-Rank into an SS-Rank, it takes 30 Inver-Shards.
S-Rank Omniframes
S-Rank Uniframes
SS-Rank
This Rank is attainable only through Evolution. At SS-Rank, a character is capable of unlocking their SS-Rank Passive Skill.
To Evolve an SS-Rank into an SSS-Rank, it takes 90 Inver-Shards.
SSS-Rank
This Rank is attainable only through Evolution. At SS-Rank, a character is capable of unlocking their SSS-Rank Passive Skill.
To Evolve an SSS-Rank into an SSS+ Rank, it takes 180 Inver-Shards.
SSS+ Rank
This Rank is attainable only through Evolution. At SS-Rank, a character is capable of unlocking their SSS+ Rank Passive Skill.
SSS+ Rank is the furthest any character can Evolve.