It's up to you, as a hunter in the employ of your government, to find out what happened to Pioneer 1. While the rest of the Phantasy Star series is a collection of fairly standard RPGs, PSO takes an entirely different route. PSO takes most of its cues from Diablo, running in real time and relying on your ability to hit the attack buttons in a rhythmic fashion to perform basic attack combos. There are three different character classes, and three different races to choose from. The ranger is the easiest character for beginners, as the class is quite proficient with ranged weapons.
Warriors are best with sword-type weapons.
Furthermore, androids are unable to cast techniques at all. The character creation also extends to your appearance. You can select from different heads, body types, colors, and sizes. The game's combat is simple real-time fighting. You simply walk up to enemies or aim your weapon and hit the proper attack button to strike.