Most RPG's have you play as only one character per account/save. However, there are still a lot of other characters in the game.
This question is impossible to answer unless you start collecting statistics and then average it. Because some games don't have characters, like tetris. Others, like RPGs, have multiple characters and non-player characters.
Are RPGs easily confused with CBUs?
It depends on what RPG you're playing. In a RPG like Final Fantasy, the highest limit of characters has been 5, shown in Final Fantasy VI. Other RPGs have their own system, and can limit characters.
No ... math-skills can help in RPGs that involve a lot of number crunching, but most RPGs have options in place, like auto-leveling and things that help you have fun without having to compute numbers. I would stay away from hardcore Dungeons and Dragons games, like the Neverwinter Nights series. Those games have a steep learning curve, especially if you aren't familiar with D&D game mechanics. But there many kinds of RPGs out there, it's a very versatile genre. You want to look at hack & slash action RPGs, or Japanese-style RPGs (like the Dragon Quest or Final Fantasy series), or even puzzle RPGs like Puzzle Quest.
92%
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A really great RPG online is kingdomofloathing.com. You can create characters, collect items, and level up. If you enjoy pop culture humor and RPGs, you will love Kingdom of Loathing.
2 RPGS
There are many Harry Potter RPGS (virtual games) out there. All you need to do is preform a search.
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Mostly Role Playing Games (RPGs)