It might be good to have a Hand Seal trait that reduces the cost of Jutsu by set amounts, like maybe you're efficient enough to do a Jutsu with 5 less chakra unless it costs less than 10 or something. Even if that's not a good idea, it'd be worth it just to give people more of a reason to invest in that skill because, otherwise, it's not too useful without buying a max-investment S-rank Trait or going for one-handed seals.
That trait already exists as Advanced Chakra Control. I agree that Hand Seals are relatively weak but it's not a fighting style so I'm not sure how good it would be even if you invested entirely into it. (I personally never thought it should have been a skill to begin with).
It also might be interesting to have an Espionage Trait that reduces the cost of keeping up a transformation to zero since infiltration agents are a thing. It would still only be able to last several hours at a time, but that's better than how it works right now, which is that if you have max stamina then your character can only keep a transformation going for about 10 minutes, max. To be fair, that's like 80-some posts, but a ninja faking someone's identity might need to stay disguised longer than that to really hide their identity. And if that becomes a more viable thing to do then it could lead to some interesting plot situations.
That does sound pretty neat, noted.
It could also be cool if there was more you could do with a Nindo than just using it for an armor boost, like maybe there could be a Trait where if your Nindo is proven true over someone else's then you could gain some form of benefit? Like if someone fights for their friends as their Nindo and you can prove that their friend doesn't care about them, then the person with the Nindo would lose faith and would take 10 MORE damage from attacks? BUT to take the Trait, you would have to have a Nindo as well to make it even. I dunno, the idea could probably use some work, but it'd be fun to have more to that part of a character bio to play with for more tangible effects and it'd give people more of a reason to really set up some more complex scenarios if they want.
The problem with buffing Nindo traits is that they are very easy to make always happen. If it is a powerful Trait then it's basically always up. It's a fine line.
Another idea I just had is that it might be fun to have one or two Traits based on the weather, because if there's a fog out then that would obstruct the visions of anyone whose not trained to see through it at long distances, right? And maybe some ninja would also be more adept at hiding their tracks in the snow or something. There's probably not a huge load of things you could do with it, but one or two smaller abilities would at least be a bit interesting just to give one side or another a very slight advantage in the right conditions.
I think the concept is interesting but I don't know how practical the traits would be or how often people would actually take them due to how niche they are.
It might also be cool to have a fighting style-like skill for Bukijutsu, too. I don't expect it to be as good as the Taijutsu one for the sake of balance, but it could be nice to have like a trait for swapping between an offensive and defensive stance for some kind of boost to Strength at the cost of Reflex or vice-versa to give people a bit more freedom with how they normally fight with a sword. As-is, Bukijutsu has Traits for light, heavy, and multiple weapons, but not much to distinguish how people might use the same weight-class of weapon differently, if that makes sense.
That trait already exists as Signature Style.
I think another trait that could be added would be a Bukijutsu version of [Crushing Blows], this perk reminds me of a Sakura type build which is awesome but [Anatomical Knowledge] would logically be able to be used by someone using weapons in a similar manner. The trait could give a damage boost to those using Bukijutsu if they attack internal organs. It could have the same balance, requiring Masterful Bukijutsu instead of Masterful Strength and of course [Anatomical Knowledge] would be a prerequisite as well.
Crushing Blows works for any physical attack.
I think think that Taijutsu could maybe use a buff. Right now it seems like Taijutsu is just a skill to take for a non-melee build who doesn’t want the hassle of dealing with a sword. The Taijutsu traits are somewhat stronger than bukijutsu traits, but weapon traits are strong as well and they are free. Also, Taijutsu traits are prohibitively costly. For example, in order to take both [Hard Body] and [Jab], you need 10 levels(1Str, 3Con, 3Ref, 3Tai), which is more than any other combination of traits as far as stats go. Another example is Mixed Martial Artist, which requires you to purchase it AND multiple Martial Artist traits for only the benefits of Martial Artist. I feel like if you want to be a mixed martial artist, you should just be able to stack martial artist without further investment. I don’t know if anyone else feels this way, so this whole rant might be invalid, but I haven’t seen many Taijutsu Specialists despite it being pretty dang sweet in the anime. This leads me to believe that others have noticed this disparity in power as well.
Weapons have an inherent disadvantage to them in that they can be destroyed/you can be disarmed. It's a risk/reward system. Those two traits also lend themselves to different styles of builds. One is more Constitution based, one is more Reflex based. Not all Traits within a tree are meant to be equal among all builds (Though I did bring up Hard Body before but it was during the creation process and we misjudged how effective 20 Durability would actually be). As for Mixed Martial Artist, it allows you to benefit from two free styles at once which is a huge advantage and cost reduction opposed to making a technique to gain the same benefits.