ninja werent some of the finest swordsmen in history lol in fact normal swords such as katanas typically werent even apart of the ninjas typical equippment if i remember correctly.
In all reality, Ninja's were not great swordsmen, but relied on stealth and cunning to take out their enemies. If you are refering to how Ninja's are portrayed fighting in today's video games/movies/TV shows, then I really wouldn't know what lightsaber form would match that, but Ataru or Juyo would be closest due to their more agile and less frontal assault type nature.
You trained as a samurai? Is that you the man, or you the Batman?
__________________ Recently Produced and Distributed Young but High-Ranking Political Figure of Royal Ancestry within the Modern American Town Affectionately Referred To as Bel-Air.
Ninjitsu isn't simply martial arts. It literally translates as "the skill of going unpercieved" or "the art of stealth". It involved stealth infiltration, assassination by various means (the most common being poisoning) espionage, theft and many other things. They were generally disgraced and dishonoured samurai.
So in terms of which lightsabre form is most like ninjitsu...None. If you mean specifically the typical sword fighting form then again it's none because the techniques of kendo used were heavily geared toward single strike kills. Many even focused solely on implementing a kill strike straight from the draw. The is no equivalent of this, at least to my knowledge, in any of the lightsabre forms.
Another major factor in the differences is that a lightsabre has no hilt/blade weight distribution that many real world sword techniques have to take into account. A lightsabre blade has no momentum when being swung as the blade has no weight.
If the blade is made of light then the blade can't have momentum as momentum requires mass. Which is related to my original point in that metal sword based techniques are built around the weight distribution of the sword blade and hilt (the pommel at the base of the hilt is vital) and take into account blade momentum.
luke uses kinetic force from the lightsaber to "chip away" at a wall of rock that was completely resistant to the lightsabers heat, dooku with his light-handed makashi form was getting tired from deflecting anakin's heavy-handed djem/so blows. weight can be transferred through the blade and it can be swung hard enough to knock people's weapons out of their hands and such, thus, it has some form of momentum.
though even if it were it wouldnt matter. blaster shoot "lasers" but the bolts dont move at the speed of light and they have mass. i will never understand why people try to employ real world science to starwars.
Sounds CAN be heard in space---provided you're inside the camera (i.e., the movie's audience).
Until a source comes along specifically saying that, in the Star Wars universe, energy has weight (making it matter), then a lightsaber blade has no weight.
__________________ Recently Produced and Distributed Young but High-Ranking Political Figure of Royal Ancestry within the Modern American Town Affectionately Referred To as Bel-Air.