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Description
(Kirby vs Megaman)

Connections :

Highly skilled rival swordsmen from platformer games who look similar to the protagonist.
They lead a group of warriors (the Meta-Knights and the Maverick Hunters).
Both have mysterious pasts, and are mysterious in general.
Both are rivals/allies of a protagonist that copies the abilities of others, and they sometimes join the protagonist on their adventures. Sometimes they fight the protagonist. Sometimes alternate versions of them fight the protagonist, and sometimes they have no control of their actions.
In their first chronological appearance, they were tasked with being enemies to the protagonist (Zero was built to destroy Mega Man, and by extension X, by Dr. Wily. Meta Knight guarded a piece of the Star Rod from Kirby for King Dedede). Both of them have been villains before (Zero until Sigma defeated him, Meta Knight in Revenge of Meta Knight).
Both have fought evil versions of themselves (Dark Meta Knight & Galacta Knight, Omega). There are also evil versions of both (Morpho Knight and Zero Nightmare) who they did not fight (Morpho Knight's battle is not canon, X fought Zero Nightmare).
In their own stories (Meta Knightmare/Mega Man Zero 3) Galacta Knight and Omega are the respective final bosses. They are known as the strongest warriors in their worlds and former legendary heroes who were sealed away due to fear of their power. Meta Knight/Zero have a climactic battle with them and are victorious.
Both are seen as equals to (if not more powerful than) the protagonist. By defeating the strongest warriors in their worlds, they prove this.
Both of them mentor the main character early on.
Both have thematic relations to the word "nightmare", and both have fought things called Nightmare. For Meta Knight, Nightmare (the final boss) and Nightmare Enterprises in the anime. Meta Knight's subgames are called Meta Knightmare. For Zero, the Nightmare enemies, the Nightmare Virus itself, and the Nightmare Investigators. Zero also has a history of having nightmares.
Both characters are involved in a surprising reveal: Meta Knight looking like Kirby and Zero being Dr. Wily's last creation.
Both are the last of their kind (Meta Knight is part of a dying race and one of the last Star Warriors, Zero is the last Robot Master).
At one point, they were forced to fight and kill someone close to them (Knuckle Joe's father and Iris).
Both of them have temporarily given their sword to the protagonist.
Similar abilities. Both of their swords (Galaxia and the Z-Saber) are renowned weapons that can attack with fire, electricity, wind, ice and darkness. They can heal themselves, shoot energy blasts, create duplicates of themselves, grow bat wings for flight, etc.
Both have a personal insignia on their left shoulder pads.
Both are overpowered in a crossover fighting game (Meta Knight in Brawl, Zero in MvC3).

Description
(Kirby vs Megaman)

Connections :

Highly skilled rival swordsmen from platformer games who look similar to the protagonist.
They lead a group of warriors (the Meta-Knights and the Maverick Hunters).
Both have mysterious pasts, and are mysterious in general.
Both are rivals/allies of a protagonist that copies the abilities of others, and they sometimes join the protagonist on their adventures. Sometimes they fight the protagonist. Sometimes alternate versions of them fight the protagonist, and sometimes they have no control of their actions.
In their first chronological appearance, they were tasked with being enemies to the protagonist (Zero was built to destroy Mega Man, and by extension X, by Dr. Wily. Meta Knight guarded a piece of the Star Rod from Kirby for King Dedede). Both of them have been villains before (Zero until Sigma defeated him, Meta Knight in Revenge of Meta Knight).
Both have fought evil versions of themselves (Dark Meta Knight & Galacta Knight, Omega). There are also evil versions of both (Morpho Knight and Zero Nightmare) who they did not fight (Morpho Knight's battle is not canon, X fought Zero Nightmare).
In their own stories (Meta Knightmare/Mega Man Zero 3) Galacta Knight and Omega are the respective final bosses. They are known as the strongest warriors in their worlds and former legendary heroes who were sealed away due to fear of their power. Meta Knight/Zero have a climactic battle with them and are victorious.
Both are seen as equals to (if not more powerful than) the protagonist. By defeating the strongest warriors in their worlds, they prove this.
Both of them mentor the main character early on.
Both have thematic relations to the word "nightmare", and both have fought things called Nightmare. For Meta Knight, Nightmare (the final boss) and Nightmare Enterprises in the anime. Meta Knight's subgames are called Meta Knightmare. For Zero, the Nightmare enemies, the Nightmare Virus itself, and the Nightmare Investigators. Zero also has a history of having nightmares.
Both characters are involved in a surprising reveal: Meta Knight looking like Kirby and Zero being Dr. Wily's last creation.
Both are the last of their kind (Meta Knight is part of a dying race and one of the last Star Warriors, Zero is the last Robot Master).
At one point, they were forced to fight and kill someone close to them (Knuckle Joe's father and Iris).
Both of them have temporarily given their sword to the protagonist.
Similar abilities. Both of their swords (Galaxia and the Z-Saber) are renowned weapons that can attack with fire, electricity, wind, ice and darkness. They can heal themselves, shoot energy blasts, create duplicates of themselves, grow bat wings for flight, etc.
Both have a personal insignia on their left shoulder pads.
Both are overpowered in a crossover fighting game (Meta Knight in Brawl, Zero in MvC3).