So this started off as a PM for a friend explaining why I like my mains, but turned onto a full blown essay on how Ike and Greninja have great synergy. This is in no way a character analysis, rather just how two character work together. What do you guys think? Is there any flaws, incorrect facts, or information I missed otherwise?
Ike and Greninja form and an amazing competitive core. Ike possess an amazing defensive metagame, while Greninja utilizes an unique offensive style. While these two characters have some weakness individually, their partner can cover them and brings out their full potential.
Ike is the epitome of defense. Ike has long-lasting hit-boxes, large range and disjoint, high KO power, and heavy weight. Ike's aerials come out fast and last long, which prevents opponents from approaching carelessly. Ike easily place opponents into a bad position above him with D-tilt and U-throw. Once the opponent is above Ike, he can apply fantastic pressure with U-tilt, U-smash, Eruption, and Aether. Ike can also edge-guard well with F-air and Eruption.
Ike does have his flaws. Due to his lack of projectile, Ike does fair poorly against zoning characters such as Samus and Link. Their vast array of projectiles allow them to pressure Ike without risk of being pressured themselves.
Greninja is a bizarre character. Despite being a rush-down character, he plays very different from other rush-down characters, such as Sheik and Sonic. Greninja has to commit more to his attacks, while similar characters don't have to. To offset this, Greninja can KO far easier than other rush-down characters, with moves such his smash attacks, F-air, Water Shuriken, and Substitute. Greninja also has a few unorthodox moves that can mix-up his offense. Shadow Sneak can catch an opponent off-guard and can be used out of shield. D-air resets itself once it connects with a hurt-box, meaning that it'll bounce of shields and characters, making it hard to parry.
Despite all these advantages, his commitment to attacks means that Greninja is at a a disadvantage against other rush-down characters, who weave in and out of Greninja's space. They can attack when an opening is presented before Greninja can respond.
Greninja compliments Ike due to how well he can handle zoning character. While Ike has a disadvantage against zoning characters due to his lack of projectiles, Greninja thrives against them. Greninja's speed allows him to rush down zoning characters before they can deploy their projectiles and easily invade the opponent’s space. Once there, Greninja can use his strong combo game to devastate the opponent. If the opponent manages to create space, Greninja can also use Water Shuriken to continue to apply pressure from afar.
In the same way Greninja compliments Ike, Ike support Greninja by dealing with rush-down characters. Ike can pressure rush-down characters with his large range and KO power while withstanding attacks due to his heavy weight. His long-lasting attacks prevent the opponent from invading Ike’s space. However, Ike can easily invade the opponents space with his large, disjointed range. If Ike gets caught in a combo, Ike can easily shake off the opponent with Counter.
Ike and Greninja have an amazing synergy together. Ike's large range, KO power, and weight allow him to take on characters that would give Greninja trouble. Greninja can use his speed, bizarre qualities, and flexibility to beat characters that Ike might not. By pairing up characters with opposite qualities, you can use each character to a greater capacity.