Ky Kiske is the deuteragonist of the Guilty Gear series and Sol Badguy's rival. A former member of the Sacred Order of Holy Knights during the Crusades, Ky is a charismatic swordsman who possesses a strong sense of justice and piety, which sustain and guide him through all manner of shaking uncertainties.

Ky is a religious man, the adjective describing both his devotion to God, as well as his commitment to the ideals of justice, order, and honor. Of a straightforward and serious personality, Ky is kind-hearted, charismatic, honest, diligent, polite, and believes in fair play. He is also chivalrous, being known to hold back against female opponents, and is utterly dedicated to protecting the weak.


Mahiro Oyama was just a normal erotic-game loving dude…until he woke up one morning as a woman! Turns out his mad-scientist little sister, Mihari, tried out one of her new experiments on him…with a disastrous outcome, as far as Mahiro’s concerned! But Mihari is as determined to study him as he is determined to go back to his shut-in, game-playing life, and one thing’s for sure…life is going to get a whole lot weirder from here on out! 
 
(Source: Kodansha USA)

After the decline of the once robust fields of science and technology, a new energy source known as magic fuels the modern era. Humanity creates forbidden biological weapons: Gears. Those Gears eventually stand against humanity in a rebellion. Although they manage to overcome in the struggle for survival known as the Crusades, humanity’s losses are so great that even after several decades pass, their emotional wounds remain unable to fully heal. Sin Kiske, the child of a human and a Gear, heads to his father Ky and mother Dizzy’s wedding ceremony. Their wedding breaks the ultimate taboo: a union between a human and a Gear. Even with the world at peace, it took many years for such a ceremony to come to fruition. Despite the complex array of emotions surrounding it, the wedding ceremony is met with blessings. When suddenly, a mysterious girl appears… The fated child inheriting Gear blood–and the mysterious girl who despises Gears. Their meeting would shake the world. 
(Source: Arc System Works YouTube Description)

Initially unveiled at EVO 2022, a music video to commemorate the 1st Anniversary of "GUILTY GEAR -STRIVE-", animated by studio SANZIGEN. The video, directed by Shinpei Ishikawa, features the theme song Find Your One Way of the main character of the series: Sol Badguy. This music video depicts more than 20 years of the world of Guilty Gear and half his lifetime!
 
(Source: Arc System Works Twitter, edited)

Set in the year between the events of the first two games, the story revolves around two new characters exclusive to the manga: Tyr and Mizuha, and the mystery of severed Gear parts falling from the sky.  Members of the Post War Administration Bureau (P.W.A.B. for short) - the secretive organization responsible for many events in the games - serve as the antagonists of the story.  Characters from the games, such as Sol, Ky, Axl, Potemkin and Kliff, also appear, albeit with relatively minor roles.