Okay. The nails open an opportunity to get into close range and cut the opponent down should the jutsu succeed.
Advantage
• Can stab the opponents feet, rendering them nearly defenseless should they try to run, which would turn out to be futile
Disadvantage
• Should the opponent somehow know where the nails are (Byakugan or metagaming) they can counter the jutsu and use my own needles against me
I would use this in battle to escape. Simply using this then running away gives me the chance to run away while halting my enemy.
Next. Some more needles coming out of my mouth. Ouch. Simple enough though, not a very often used jutsu that I know of, can also be used to attack the opponents eyes or ears to take away one of their senses.
Advantage
• Can stop a sense such as hearing/seeing if used properly
Disadvantage
• The opponent can blow it away or back at me with a strong wind jutsu
I don't personally see myself using this jutsu mainly because most of these ninjutsu techniques are boring and dull but that is just how ninjutsu is. I'm only training in it to get closer to being a sensei. But i'd use this jutsu in close range to blind the opponent.
Finally. This one is rather useful since it can attack in a 360° radius around you. Attacks multiple opponents.
Advantage
• Can attack multiple opponents and give you the chance to run or escape by other methods (Hiding Like a Mole)
Disadvantages
• It's too obvious and requires the jutsu to be listed in my bio as an umbrella.
I would use this if I carried an umbrella but as I don't, can't really use it now can I?
And just to make you mad. I'd combine all these with a lightning jutsu
