In addition to video games, I've developed
rules for d20, classes, magical items and campaign settings. I
have never submitted anything for publication, they're just exercises in
using the system. Below are two character classes I developed for
d20 Modern. The premise is these are two Advanced Classes for a
crime-themed game along the lines of Ocean's 11. The point was to
have something exciting, cinematic and challenging without using any
psionics, monsters or magic.
Also, a roleplaying buddy of mine (and one time DM) was lamenting a kind of Jack of all Trades character. I thought about it and went to work on what I thought was a great character. He may not be balanced, because this is very much the character I would play if given the chance, but I haven't ever gotten the chance to playtest. The name, I took from the guy who posed the problem (he called his a Jack). We ended up going in very different directions, I went with a basic skill-monger, a character who just goes out and aquires knowledge and talents without ever really mastering any particular discipline (bardic music, arcane magic, martial ability).
I've played in or run a pen and paper RPG for the last 8 years.
Also, I play a great deal of other tabletop games such as Carcassone, Puerto Rico and Set. I enjoy playing these games because they have some refreshing things to teach about game design. For instance, Chess is balanced by having every player have the same numbers and types of pieces. However, the Tibetan game Kungser has two totally different sides, with 24 passive monks against 2 violent princes.