At the most basic level, you'll need to pick from one of the three character classes. While the classes are a diverse lot, they're also well-balanced. Though some may take longer to build up, you won't find any slouches or slackers. In addition to the class types, there are also three different races to choose from. Humans are jacks of all trades, though not experts at anything in particular.
Androids are physically stronger than humans, though they lack any kind of magic-using ability.
Finally, Numans are slight in constitution but are adept at casting spells. The RAmar, since he's human, can use some Techniques, though his physical attacks aren't as strong as the other Rangers'. After players settle on a character type they can fiddle around with appearances. Even more interesting is the ability to adjust height and girth, so players can be rail thin or morbidly obese. These changes don't matter that much in the one-player game, but they're actually a helpful way to differentiate potentially identical characters while playing online.