There are three hunters in PSO, each one is described below. Note that the max stats are from falsehead's PSO FAQ, located at GameFAQs. It saved me time to use them rather than maxing each character on my own. So thank you falsehead. =D Also, the HP and TP stats are not necessarily the max, your HP and TP depends on how many materials you've used, as well as how many level up bonuses you've gotten.
The HUcast is the powerhouse character of PSO, he has the highest ATP of all characters, and the best HP of the hunters. If you want to do the most damage possible, HUcast is your best bet.
HUcast max stats
The HUmar is the most popular character, probably because he's the easiest character for new players. His ATP and HP are the second highest of the hunters, and he also has the ability to cast magic. Although his MST is the lowest of all magic using characters, he has enough to make him more flexible than the HUcast.
HUmar max stats
The HUnewearl is one of the most balanced characters of PSO. She is a bit low on HP and ATP compared to the other hunters, but she has the best MST of all the non-force magic using characters.