Max ranks at lvl. 3

[Froogleyboy]

what are the max ranks for a 3rd level fast hero?

[Hat-Trick]

Max ranks for a third level anything is 6 for class, 3 for cross-class, unless there's something about a Fast Hero I don't know about.

[AmberVael]

The equations for max ranks at any level:

Class skill:
Current level + 3 = Max Skill ranks

Cross Class Skill:
(Current level +3) / 2 = Max Skill ranks