The main characters never seem to tire. Given that PC's are supposed to be Main Characters I wouldn't want it overly tiring.
Agreed that I'd rather not have them tire too much. But I'd like to have the option of tiring myself to get more spectacular results.
They should be exceptional benders. The pro-bending always felt silly. I mean compare Mako's antics at the ned of the series to what he does in the ring. It's like he doesn't do anything in the ring and is weakening his attacks to non-lethal levels. It always felt worng. Maybe weakening bending is tiring? That's all I've managed to figure out.
It may have more to do with control, I think (partially). In the ring they have a set of very clearly defined rules that they must use (what parts of the opponent you can hit, where you can direct your attacks, where you can draw elements from, and such).
But above all, I think that pro bending had the characters doing much more extraneous movements than general bending. They have the "enemy" literally in their faces, and the move and dodge constantly, very fast, so the tire out faster.
Or at least, I think that was the intent.
Chi-blocking should be beyond a stunt. It's too powerful otherwise, given that they can totally incap a given body part with it as well.
I'm of two minds about that. For one, I see what you're saying and kinda agree. But in the other hand, I want normal people being able to learn chi-blocking if they want to (provided thay find someone to learn from). That said, it should be in the same scale of power that bending, up close.
Standard extra elements(Flight, Ice, Swamp, Earth, and Lightning should require an 7.) Blood should be a 8. 10 to use outside the full moon.)
Not really agree. At all. For starters, airbenders simply can't fly without their fliers, and even their kids get to fly that way, so 7 no. No way. Same with ice: Katara was using ice before knowing to actually bend. Swamp just bends the water in the plants, so I think that a normal stunt should be enough (but you'd need either someone to learn it from or to spend a lot of time figuring it out).
Blood should be a secret, I think, and maybe would require a minimum level. Bloodbending out of full moon should be basically impossible without the proper bloodline or similar. If bloodbending required rank 10 bending, Korra probably wouldn't have been able to overpower Tarrlok, not even using other elements.
Spirit should require 1 7 and 3 6's as well as a spirit score above 6.
I think "you need to be the avatar, and you need to mater the other elements first" would suffice, personally. Although the spirit score minimum would be nice.
Being an Avatar should be high power level. Everything else mid/average.
The avatars we've seen weren't really more powered than the rest of the people, usually, at least not when not in the avatar state. They usually were just very good in their element (or their preferred one, like Korra).
Actually, now that I think about it, Korra was something of a prodigy bender even for avatar standards, as she was able to bend other elements than her own from the very start. Usually avatars are only able to bend their own element until they start their avatar training and start learning to bend the other ones. Taking that into account, probably the avatar should start with just one element bending, but at a higher level, and being able to learn the other ones.
I wouldn't change the stats. Resources doesn't fit the story well, but in a campaign it is very important. Especially for Props.
Well, for the original series I agree it doesn't fit perfectly, but for the new one it would be kinda nice, I think.
Props could be a variety of things. Nothing too exorbient needs to be added.