This strategy formation and combat guide will be towards my current main ninja; The Midnight Blade.
Intro
The Midnight Blade is a lightning style kenjutsu user which means he excels at high DPS and Assassination of weaker enemy units, for instance an example of this would be his "Killing Intent of Warrior" passive which enables him to refresh his cooldown on his mystery skill if he gets a kill with it.

Mystery Skill
-Sealing Slash, Best for quick assassinations of 1 enemy unit goes well with "killing intent".
-Chidori Blade Shadow, Best for weak enemy parties where 1 combo chain can kill off weaker unit and cause paralyzation to stifle enemy combos.
-Lightning Armor, Best for 9 Tails World Event Boss for good damage after 2-3 rounds before tailed beast bomb wipes party.

Team
The ideal team for The Midnight Blade would be someone who if able to keep a combo going and who is able to increase your critical attack rate/damage. So the types of shinobi you should be looking at are:
-Sasuke, great combo chasers and a lightning style buff with Kirin
-TenTen, for her round starting critical tips which greatly increases critical hit rate
-Kakashi, great for combo chasers and the only lightning style user with an earth style attack (Fanged Pursuit Jutsu)
-Hinata, as The Midnight Blade you will either be repulsing/low float/knockdown and hinata works great in harmony with you on this and her kit

*Note all ninjas listed are obtainable for free*

Myself
So as you may be wondering I am a Midnight Blade myself so who do i use you ask?


Note that my combo revolves around keeping the enemy constantly going up and down with my main focusing on knockdowns and my supports (Kabuto and Karin) focusing on High Floats. With this team I am able to inflict Ignition ( Burning damage at the start of round) and Poisoning ( Poison damage at the start of round) all the while my Midnight Blade is doing heavy AoE (Area of Effect) damage to their entire team which makes then enemy team die in about 2-3 rounds.

This Combination is good for taking out enemy healers and killing the team fast with poisons, fire, and AoE lightning style Jutsu (Chidori Blade + Kirin).

Tips/Notes
While the Midnight Blade is a great DPS remember he is what a coventinal MMO would call a rogue/assassin and this archetype has its drawbacks. But also gains the benefits of this archetype.
- Low Health
- Wind Style weakness, this hurts do to the amount of wind ninja players what with gaara, naruto, and the wind main.....Rasengans are your enemy.
- High Initiative, if your Midnight Blade is onthe first row your Mystery Skill are pretty much garunteed to activate before the enemies which means sealing away their precious jutsu or paralyzing them to ensure they cant combo.

Thank You and have fun out there Ninja's!