Sharing my thoughts here:

Any% — This already exists, and is a good indicator of the player's sequential knowledge of the game. However, it essentially removes any RNG based on drops, encounters, etc.

Any% No Teleport — The game is obscure enough without adding in the fact that an Any% run is fully reliant on the player's awareness of the ability to teleport. Having a No Teleport option would (I feel) make speedrunning the game attractive to a wider base of individuals since it would create a distinctly separate category for players to practice.

All Rings — I've done a bit of messing around but have never gotten through the door without all the rings...would be cool to see this if it was possible.

Glitchless — Removing the ability to teleport would be nice, removing exp farming would be...interesting. If you play the entire game sequentially (as laid out in the manual), I am fairly certain you reach the end of the game pretty far from 9th level, which doesn't make the game impossible, but does make the Motarin and Darius fights heavily RNG dependent.

100% — This would be a money grind and little else, to say nothing of having to find every single note in the game. Requiring All Characters might be nice, but just from a moderation standpoint I feel like this would be a terrible category to verify.

Void% — Would be funny, but I can see runs in this category being about two minutes long...would really depend on whether such a short category would be allowed / appropriate according to the SR.com rules.