Funnily enough, Scrops made a clarification about Nagashi in the RP updates late last night xD
Any questions about this?Nagashi: there is a confusion about what nagashi can or can't do. Nagashi is unfocused lightning that spreads throughout the user. It can numb and paralyze opponents. Though, it can be used in different ways. If you channel it through B-Rank earth, wood, etc up to S-Rank (of anything weak to lightning) it willspread through it and neutralize the technique but won't destroy it. Nagashi only has detructive properties if a big difference in ranks exist (C-Rank or lower). It has not tangible properties. If used from the body as a omnidirectional "spread", it will only reach up to Short Range of the user. If used through the ground and targetting a piece of metal or other conductors stuck on the ground (like a kunai near your enemy or similar), it can reach mid range but in this case will not have any omnidirectional abilities.
Chidori Variations: Ok, none requires you to use chidori before and they only require handseals if they were seen in the manga or anime to require them. Normally, And I checked, all of the techniques that fit under "chidori variations" have an acurrate description of what they need and if they don't say they need handseals, they don't.