Shin no Ippō (心の一方, "One Side of the Soul") (Rurouni Kenshin/Samurai X)
The user can control their killing intention and use it to intimidate others, it can be used in two ways:
The user can give off their pure killing intent, affecting opponents, themselves, and others around the vicinity. Particularly strong killing intent can paralyze the victim in fear, causing them to morbidly hallucinate their own deaths, or even kill them by forcing the mind to believe their death is a reality.
Suppression and Perception
If the user has mastered control over their emotions, they can control their killing intent by suppressing it, to prevent their opposition from discovering it, thus hiding one's motives and preventing one from being tracked by such emotions.
Anyone who can also perceive a foe's killing intent can perceive the foe's next move and prepare the next appropriate move in advance.
Apathy: by suppressing the intent while retaining the desire to kill.
When getting serious for fights, Gildarts Clive (Fairy Tail) exudes tremendous power with the intent to crush them.
Wall Eehto (Fairy Tail) when he enters Assault Mode, he modified his killing intent to focus solely on Laxus Dreyar.
While he is usually a chill and goofy man, Gintoki Sakata (Gintama) can exude an intense amount of killing intent towards his opponents whenever he gets serious or is enraged like during his fight with Jirocho.
Gang Ryong's (Gosu) killing intent manifesting as a colossal Tiger.
Hisoka Marrow (Hunter x Hunter) has an insatiable love for spilling the blood of powerful fighters in combat and his enjoyment of extreme pain while doing so fuels his seemingly sadomasochistic desires.
Killua Zoldyck (Hunter x Hunter) threatening Sadaso.
Neferpitou's (Hunter x Hunter) killing intent is the strongest of all the Royal Guards, capable of reaching up to 2 kilometers.
Gon Freecss (Hunter x Hunter) displaying a malicious Ren.
InuYasha (InuYasha) in his full demon persona, is so full of killing intent that the mind-reading Goshinki could not follow.
Iggy (JoJo's Bizarre Adventure Part III: Stardust Crusaders)
By simply aiming his blowgun, Muta (Kingdom) exudes his killing intent towards Ri Shin as he breaks out in a cold sweat.
Due to their camaraderie, Kyou Kai (Kingdom) exuded no killing intent towards Ri Shin during their bloody duel...
...but later give off an intense amount after he continually taunted her while he senses the maddening intent of the Shukyou assassins.
After surviving countless bloody battles, Rin Ko of the Four Heavenly King’s (Kingdom) killing intent…
…manifested itself as a Fierce Tiger.
While a calm strategist with an unreadable poker face, Kei Sha the Silent Hunter’s (Kingdom) killing intent was so intense that it manifested in the form of a Spider.
Morlun (Marvel Comics) projecting his Predatory Instincts towards Spider-Man.
The very presence of All For One (My Hero Academia) was enough to make Izuku and friends see their own deaths.
Chizome Akaguro/The Hero Killer Stain's (My Hero Academia) hatred and desire to purge the world of fake Heroes manifests as malefic aura so intense it paralyzed everyone in range, including powerful and skilled Hero Gran Torino and No 2. Hero Endeavour, in fear.
During the fight when Kurama the Nine-Tails Fox first spilled into him, Naruto Uzumaki (Naruto) gave off such an intense amount of ghastly, wrathful bloodlust that Haku stated it was evil itself.
Orochimaru (Naruto) exuding his killing intent to shock Sasuke and Sakura.
Sasuke Uchiha (Naruto) releasing his killing intent to paralyze both Suigetsu and Jūgo from fighting anymore.
Kabuto Yakushi (Naruto) exuding a large amount of killing intent at times, scaring Oboro and his teammates.
Red Haired Shanks (One Piece) displays his Conqueror's/Haoshoku Haki.
When Arlong (One Piece) is angry, his eyes are a reflection of his killing intent.
Hody Jones (One Piece) overdosed on Energy Steroids, making his killing intent overflowing and unstable.
Akame (Akame Ga Kill!) suppressing her killing intent while fighting Zank the Beheader to prevent him from reading her movements.
Nagisa Shiota (Assassination Classroom) possesses incredibly potent natural instincts for assassination that allow him to completely suppress his killing intent to the point that not even highly trained assassins or veteran soldiers can detect it.
With impressive skill, Mikoshiba Ryouma (Record of Wortenia War) can suppress and hide his killing intent behind a smile.
Giving his trademark false smile, Seta Sōjirō (Rurouni Kenshin) exudes no killing intent while apathetically taking lives.
Years of living with his deranged mother and having to endure her mental abuse and anticipate when her psychotic outbursts would occur has made him highly perceptive to the inner thoughts and emotions of others, enabling Nagisa Shiota (Assassination Classroom) to read and gauge their state of mind just by looking at them to determine when or how they are most vulnerable.
As a God of Destruction, Beerus (Dragon Ball Super) can sense the killing intent of others, allowing him to deduce that Zamasu was planning to kill Gowasu when no one else could.
With his trained senses, Jean Pierre Polnareff (JoJo's Bizarre Adventure Part III: Stardust Crusaders) can detect any amount of killing intent aimed towards him.
With his mastery over Kenbunshoku/Observation Haki, Monkey D. Luffy (One Piece) can sense killing intent.
Sung Jin-Woo (Solo Leveling)
Parasites such as Migi (Parasyte) can sense, not only the mood of other parasites, but their murderous intent as well.
As a trained martial artist, Mikoshiba Ryouma (Record of Wortenia War) can sense any killing intent directed towards him.
Even while smiling serenely, Retsu Unohana, being the first Kenpachi and the most diabolical criminal to have existed within Soul Society, can get people to do what she 'requests' by projecting Killing Intent.