Those are the stats possible in the status of the MC. Normal adventurers have a maximum of the letter S.
*The numbers in between (_._) are the strength of his cards and their comparison.*
**Note that the first number of (_._) is the level and the second number is the equivalent of the letter.**
***After the card strength reaches 1.9 it changes to 2.0. Well you get it, right?***
Status
I 0-99 (1.0)
H 100-199 (1.1)
G 200-299 (1.2)
F 300-399 (1.3)
E 400-499 (1.4)
D 500-599 (1.5)
C 600-699 (1.6)
B 700-799 (1.7)
A 800-899 (1.8)
S 900-999 (1.9)
SS 1000-1249
SSS 1250-1499
EX 1500
When one levels up, they gain a 20% increase boost in their stats which is why it is almost impossible to beat someone with a higher levels than you. It is also the reason why most adventurers levels up as soon as possible since it gives quick gains.
Excelia gain of the MC
Level 1: 0-999 -> Fighting level 1 monsters weak to strong
Level 1: 1000-1500 -> Fighting level 2 monsters weak to moderately weak
Level 2: 0-999 -> Fighting level 2 monsters weak to strong
Level 2: 1000-1500 -> Fighting level 3 monsters weak to moderately weak
And so on.
You can see that while at level one he needs to fight some level 2 monsters to continue gaining excelia once he surpassed 999, once he reaches level two, he continue to gain excelia just like every other level 2 adventurers. Meaning, he can fight the weakest of level 2 monsters once he levels up and he would still gain plenty of excelia like all the others adventurers.
- Feel free to leave questions in the comment section and I'll do my best to answer you.