The stats are what Humans, Demigods, and Gods need to achieve each rank. It is the same for all of them, although Gods would generally be born with higher stats than either demigods or mortals since, ya know, they are gods. Anyways, for Percy, at least at this moment only him, when he ranks up from F to E, it does not mean his stats will just hit 100 and stick there. All stats will increase once you go up in rank. There is a bottleneck at each rank, such as for F rank, 5 stats need to hit 99 before a rank up can occur. At the time of rank up all stats, even the ones that have not hit 99, will receive a boost. Since each rank corresponds to a specific physical change. Like the body is strengthened overall with each rank. It is so that there is a disparity between ranks, so that the majority of High F ranks could not defeat a Low E rank unless the F rank was very skilled.

Ranks of Humans/Demigods/Gods

Stats

F 0-99

E 100-199

D 200-299

C 300-399

B 400-599

A 600-799

S 800-999

SS 1000-1499

SSS 1500- 1999

EX 2000-4999

T 5000~

Ranks of Monsters/Dungeons/Skills

F-

F

F+

E-

E

E+

D-

D

D+

C-

C

C+

B-

B

B+

A-

A

A+

S-

S

S+

SS-

SS

SS+

SSS-

SSS

SSS+

EX-

EX

EX+

T

Item Ranks

F

E

D

C

B

A

S

SS

SSS

EX

T