Top side anime characters… sometimes the protagonist isn’t always the fans’ favorite. Some of the side anime characters excel beyond the main character in certain or various aspects, winning the hearts of fans, whether it’s due to their intricate character development or simply their charm. Here are 15 of the most notable side anime characters who have garnered more fame than the main characters in their respective series.
15. Rengoku Kyojuro (Demon Slayer: Mugen Train)
Rengoku Kyojuro may have had a brief appearance in Demon Slayer: Mugen Train, but he left a profound impression. The Flame Hashira embodies passion, strength, and unwavering determination, making him impossible not to adore. He possesses an exaggerated, larger-than-life presence, yet there’s a heartfelt sincerity within him as he dedicates himself to safeguarding others.
His demise was heart-wrenching, solidifying his status as one of the series’ most unforgettable characters. Rengoku embodies far more than just strength — he injects Mugen Train with its essence.
14. Gilgamesh (the Fate series)
This self-proclaimed “King of Heroes” flaunts an ego as expansive as his fabled treasure hoard. In the Fate series, he’s not your everyday antagonist; he possesses charisma, flair, and a distorted sense of grandeur that captivates and frustrates in equal measure.
With his god-like abilities and boundless pride, he’s a character that exudes confidence. Whether you’re a fan or a detractor, there’s no denying Gilgamesh’s unforgettable nature.
13. Killua Zoldyck (HxH)
Killua Zoldyck started off as a seemingly indifferent assassin-turned-ally but rapidly became a fan favorite in Hunter x Hunter. His abilities — lightning speed, immense strength, and intelligence — render him significantly more popular than the series’ main character, Gon Freecss. This is evident not only on MAL (#6) but also in nearly every popularity ranking survey.
Their bond is a crucial aspect of the narrative, yet Killua’s struggles with family, personal fears, and self-discovery elevate him beyond a mere side character. His wit, intellect, and moments of vulnerability portray Killua as more than just Gon’s companion — he’s a protagonist in his own right.
12. Roy Mustang (FMA)
Roy Mustang epitomizes composure under pressure. A flame alchemist with piercing eyes and a sharp intellect, Roy always has plans brewing beneath the surface. In Fullmetal Alchemist, while Edward takes the lead, Mustang clearly steals the spotlight with every fiery flick of his wrist.
His signature fire attacks are matched only by his intricate character arc, which shines brightest during moments of grief, vengeance, and sacrifice.
11. Levi Ackerman (AoT)
“Humanity’s strongest soldier” essentially became the franchise’s face for many fans. Levi is undoubtedly the coolest human character in the entire series. People tune in just to witness his battles and his no-nonsense demeanor. His fanbase? Enormous! Currently ranked #3 on MAL, he eclipsed not just the protagonist but also beloved characters like Killua Zoldyck, L Lawliet, and Roronoa Zoro.
Even with a somewhat limited backstory initially, his compelling presence made every scene featuring the short powerhouse impactful, precise, and intensely engaging. From his signature spinning slash to his ruthlessness against both Titans and humans, he sets the standard for badassery in anime.
10. Esdeath (Akame ga Kill)
While technically a villain, Esdeath often overshadowed others whenever she was on screen.
- Charisma? Off the charts.
- Power? Unmatched.
- Romantic fixation on the MC? Wildly unhinged, yet strangely engaging.
- Presence? With every arrival, you knew the stakes were about to escalate.
She’s not merely memorable; Esdeath emerged as one of the most iconic female antagonists in anime. Numerous fans confess they were more invested emotionally in her character than in either Tatsumi or Akame.
9. Gojou Satoru (JJK)
“The strongest sorcerer alive” — Gojou Satoru doesn’t just walk into a scene; he claims it. The moment he steps into Jujutsu Kaisen, his blindfolded coolness, insane power levels, and chaotic energy render him impossible to overlook. Fans were instantly captivated by his blend of goofy educator vibes and intimidating combat prowess.
His battles are cinematic, his demeanor relaxed, and his presence electric. He’s the character that elevates a strong series into a cultural phenomenon. Even with Yuji as the main character, Gojo often feels like the essence of the show—cool, enigmatic, and perpetually meme-worthy. A genuine fan-favorite.
8. Dazai Osamu (Bungou Stray Dogs)
Frequently, I forget that Atsushi is the main character — the supporting cast in this anime outshines so many others! Personally, I’m fond of Dazai, so I focused on him.
His humor may be playful, but it conceals a much darker side. Once part of the Port Mafia, his past is riddled with memories that still haunt him. He masks all that pain behind a carefree exterior, yet it’s always apparent.
Dazai’s cunning and unpredictable nature create excitement, but it’s his emotional turmoil that adds depth to his character. He isn’t just comic relief — Dazai’s story is multifaceted, and once you recognize that, he becomes utterly captivating.
7. Accelerator (A Certain Magical Index)
The protagonist in A Certain Magical Index may be Touma, but Accelerator’s character journey is far more intricate and enjoyable to witness.
At first, Accelerator is that character you love to dislike. Dubbed the most powerful esper in Academy City, he possesses the extraordinary ability to manipulate vectors, controlling everything from force to velocity.
Initially, he’s a real jerk, cold and ruthless, but as the series progresses, you begin to see a more humane aspect of him. He evolves beyond just a villain, showcasing deeper inner conflicts. In fact, his transformation stands out as one of the best elements of the Toaru series.
6. Yuno Gasai (The Future Diary)
When discussing Future Diary, most fans don’t immediately think of Yukiteru Amano, the main character, but rather the standout female lead — Yuno Gasai.
Yuno was voted as the series’ most popular character by the devoted fanbase. At one point, even those unfamiliar with The Future Diary were aware of the infamous yandere Yuno meme. It’s safe to say that Yuno is recognized as the quintessential Yandere.
5. Shoto Todoroki (My Hero Academia)
While Deku is endearing and a solid character, fans have shown more allegiance and affection towards one of the side anime characters, Todoroki.
Shoto initially presented a cold, detached demeanor shaped by his abusive childhood and complicated family dynamics. He often reminds me of Zuko from Avatar: The Last Airbender. We can only hope this precious character continues to forge friendships and learn to connect with others.
4. L Lawliet (Death Note)
The clash between L and Kira, specifically Light Yagami, was simply masterful. An intellectual battle between two sharp minds left fans breathless. Viewers were glued to their screens, diving deep into the manga to witness this cerebral duel.
Even as the second protagonist, L’s notoriety rivals that of the primary character, Light Yagami. In fact, L likely captures more affection from fans than Light does. Just consider the number of cosplays; L is commonly represented. Additionally, fandom sites boasts more theories and headcanons surrounding L than many other characters.
3. Karma Akabane (Assassination Classroom)
Karma quickly became a fan favorite, often admired even more than the main character, Nagisa. He may initially appear to be lazy and mischievous, but soon it becomes evident that he’s genuinely kind and diligent.
2. Sebastian Michaelis (Black Butler)
Black Butler revolves around Ciel Phantomhive, but Sebastian, his butler, often steals the show. While they share a co-starring role, Ciel unquestionably leads, whereas Sebastian primarily tends to his commands. However, Sebastian is an exceptional butler—it’s no wonder fans adore him!
1. Megumin (KonoSuba: God’s Blessing on This Wonderful World!)
I would be shocked if you didn’t recognize Megumin from Konosuba, also known as God’s Blessing on This Wonderful World. She stands out in her red attire and has captured the hearts of many as a beloved waifu. The actual main character is often overlooked or seems less appreciated by fans in comparison. However, despite her flaws, Megumin remains a fan favorite.
What do you think? Do you prefer these side anime characters over the main ones? Who else do you believe deserves a spot on this list? Share your thoughts in the comments below!
As always,
Keep Smiling!