Through your journey, you are definitely going to get stronger and wiser. And the way to show it is through leveling up!
When you complete missions, you gain 3 things:
3. Stat Points
1.) Zenni -- Zenni is the currency for this world, use it to purchase things like techniques and items. This is standard-issue and is handed out to all whom finish a regular mission role play or a battle.
2.) EXP -- Experience Points(EXP) are handed out based on your effort. If you write over the limit of the mission you may be working on, your bound to get more EXP than usual. Even if you lose a battle, if you did well, you will get a lot of EXP.
3.) Stat Points -- These stat points are used to, obviously, increase your stats. There is only one way to gain this-battles. Spars, death-matches, training, you name it, as long as it's a fight you'll gain SP, and it also reflects your battle effort.
In order to level up, you need to acquire the same amount of EXP as the NEXT LEVEl you can get time 100. So, everyone starts on level zero, and to level up, you need 100 EXP.
You can level up as many times as possible, but the limit is level 500(If anyone gets there I will praise them...)
Every time you level up you gain 1/4 of the Exp you obtained as Stat Points, for example, If I leveled up to level 10(1000 EXP) then I get 250 SP.
*Rounded up. 1.5 sp = 2 sp, etc.*