In One Way Heroics when a class gains enough experience % they will gain a level, upon which one stat point or perk will increase.
Their are 8 classes in one way heroics and each class will favour a specific stat upon leveling up.
This guide lists the various classes and the chance they have to gain a specific stat or perk when they gain a level.

The table shows what % chance a stat or perk has of going up +1 whenever you gain a level.
For example, the Force User has a 25% chance of gaining +1 Willpower so when building a force user you may want to devote points elsewhere.

A 0% means the class never gains any points in that trait on leveling up, for example the pirate never gains any points in Charm.

When you pick a class it will gain stats randomly for the 1st 100 levels as dictated by the chart above, however once you reach level 100 the stats will forever loop from then on, for example:

Lv1 Strength
Lv2 Stamina
Lv3 Willpower
...
Lv101 Strength
Lv102 Stamina
Lv103 Willpower

While it is rare to get 0 rolls in a stat that the chart says you should, remember it is possible and if you reach level 100 and still gain nothing in a stat that you should, then it means you will never gain any during that run.

Original chart compiled from http://katamichihero.wiki.fc2.com/wiki/創世時のTIPS
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