This article is about a recently released or soft-released part of a Plants vs. Zombies game. As such, spoilers may be revealed. Read at your own risk!
"His motto: Walk softly and carry a big nunchuck."
Strategies
With
Mini-Ninja's usefulness in the battlefield is twofold, with the most obvious one being a tool to land quick strikes on the enemy hero. In the early game, Mini-Ninja will find a fair amount of opportunity to attack the plant hero directly, and various effects from tricks such as Smoke Bomb, Terrify, or from zombies like Sumo Wrestler can also help clear the way and extends the zombie's value. In the late game, however, Mini-Ninja will struggle to find its place due to its poor stats and lack of empty lanes to work, so it should be phased out in favor of more powerful cards such as Walrus Rider.
Toxic Waste Imp can allow Mini-Ninja (or even a normal Imp) to destroy anything that tries to block it, with the exception of Armored plants.
Mini-Ninja, however, can also be used as a potent distraction. On the first turn, Mini-Ninja can be played to force the enemy to play reaction plants, instead of potentially more useful ones like Pea Pod and Sunflower. However, it can be countered very easily on turn one. Late game, Mini-Ninja can be deployed alongside more powerful zombies to force the plant hero to split their efforts. Either the enemy will have to scatter their defenses and reduce their overall chance of survival, or focus on the more powerful zombies and leave Mini-Ninja untouched.
Against
Due to its low health, it can be destroyed by almost every plant fighter or tricks. Watch out for a potential trick that can move Mini-Ninja or the plant in front of it.