I feel bad for having a SquidBoards account but doing the large majority of my socializing on the game in here. I just love Nintendo multiplayer GAF too much. :lol
OK, so the obvious reason why ninja squid is amazing is because in situations where you have access to large pools of your team's ink, it opens up a new world of approach and retreat options since there is literally no visual confirmation of someone's presence in the ink. This leads to emergent situations like the following (from my own and my brother's time spent playing the game so far):
- In turf wars:
-- Ninja squid is pretty much tailor made for short range weapons and rollers. Short rangers who are good about shooting, jumping into ink then leaping out for shots can seriously make a lot of undetectable inroads if you know when to jump and when to just swim/be patient. If you jump a lot and get detected, you will get lit up and as such just knowing how to move can be immensely rewarding. There's a lot of last second victories that can be pulled off with this strategy.
- Using Grenades and Bombs
-- Seriously, any angle becomes a vantage point with ninja squid. Suspect some enemy activity on a ledge but don't want to fire and give away all your positioning? Unsquid, chuck bomb, re-squid. The more obtuse you make your toss arcs or the positioning of the weapon, the greater chance you have of getting someone jumpy
- Using Seekers (Legitimately my favorite use)
--Throwing one forward and using the line of ink to travel faster and undetectably into territory is absolutely gorgeous. People see a seeker coming towards them and they either dodge or just jump over it/squid form to have it go away without considering just how much inroads can be made off it. Stopping anywhere along the line of ink can lead to some impressive mind games once you can confirm that the opposing team is sniffing out suspicious Seeker activity. Otherwise, charging in undetected can lead to a lot of reclaimed turf that people wouldn't be ready to come back and defend without a strong intuition. Ask CoasterFreak how I literally passed right beside him during the last 4 seconds of a turf war to completely coat his base in ink when he was the last person out of the respawn thanks to a clutch last second seeker.
- Assisting Snipers
-- it's the same line laying strategies as mentioned above except now you can form a two person unit where the sniper is laying out crazy paths and picking at key threats from long range while you're assassinating anything that comes along trying to give the sniper problems. Sendou and I were doing this by accident (can't tell intent because no voice chat) last night, I wonder if he noticed.
- Devil May Cry
-- Run into an enemy while you're painting a line down a small path and they have visual confirmation of you before getting into the ink? Goad them into following you with weapon fire, then squid form back a bit, coat a wall and chill in the wall. Since they can't see you move, you can continue reorienting yourself and surprise them with an ambush from off the goddamn wall.
- Combining it with the bubbler
-- I'm convinced that Bubbler + Ninja Squid + high fire rate weapons are the meta for walling entire teams out when you don't want to be hyper obvious and use Rollers for the job. This setup is just tailor made for going into bases and annihilating threats as they spawn or just wasting time engaging people at their home base while your team inks the rest of the stage.
- Combining it with Inkstrikes
-- The stupidest thing I've ever seen/done was get a 4 man kill streak on another team by sending off an inkstrike into their Splat Zone immediately after they got their own inkstrike off and taking advantage of the visual cluster fuck to establish myself in my own ink only to raid the entire area in the confusion. Better still, thanks to some great mine placing, I pretty much walled the entire team out after sending them back to their spawn point, a tactic that is still pretty undeveloped in most Splat Zone confrontations.
TL;DR: Ninja squid essentially allows you to have tremendous presence in any neutral area of the match because it turns the scenario into one where the other team is constantly guessing between any one pool of ink being there due to collateral damage, distraction, or as a ambush point that cannot be reacted to until the moment of your own action.
You need Ninja + Ink resistance to be in the enemy ink, though. At least, I think.