The first thing to understand is the actual meaning behind Kacchan. It's a portmanteau of Bakugo's first name Katsuki and the "chan" honorific. This is normally used for small children, cute girls and close friends. It can also be used for older boys.
Izuku Midoriya is shy and innocent, whereas his frenemy, Katsuki Bakugo is more abrasive. Bakugo calls Midoriya 'Deku', because he's using it mockingly in the modern sense of the word, implying that Midoriya is a “good for nothing”.
“Kacchan'' is a diminutive nickname that Izuku gave Bakugo when they were children, and it combines the first syllable of the first kanji of Bakugo's name (勝 - “katsu”) with the suffix “-chan”.
However, it is revealed in the Endeavor Agency Arc that Katsuki has chosen a hero name for himself, but has not revealed it to anyone yet. His hero name was finally revealed as Great Explosion Murder God Dynamight in the Paranormal Liberation War Arc.
Katsuki Bakugo (Japanese: 爆豪 勝己, Hepburn: Bakugō Katsuki), also known by his nickname Kacchan (かっちゃん, Katchan) and his hero name Great Explosion Murder God Dynamight (大・爆・殺・神ダイナマイト, Daibaku Kisshin Dainamaito), is a superhero and one of the main protagonists of the manga series My Hero Academia, created by Kōhei ...
While Bakugo can't do anything to make the name Kacchan sound better, he might feel he doesn't have to. For the longest time, he's allowed Midoriya to call him by this nickname because nothing he did mattered.
Manga Debut
Masaki Bakugo (爆豪勝希) is the eldest daughter of Lord Explosion (Katsuki Bakugo) the number 2 hero.
3 Edgeshot's Quirk
Edgeshot used his Quirk to save Bakugo after he was left in a near-death state by Shigaraki Tomura.
6 Bakugo Gets Very Jealous Of Midoriya's Progress
Bakugo has been Midoriya's rival since the beginning.
For those who don't know, his dad's quirk causes his sweat to become explosive when he rubs his hands, but cannot forcibly secrete the sweat itself. His mom's quirk allows her to forcibly secrete a smooth liquid from her skin.
Midoriya calls little Todoroki "Shoto-kun".
Katsuki Bakugo
When the two of you are alone, he'll call you “Baby,” “Beautiful,” and sometimes “Babygirl/boy.” He likes to call you those names specifically when the two of you are alone because it feels even more intimate and affectionate to him.
Here's what “deku” means in Japanese and in the anime My Hero Academia. Deku (木偶) is a Japanese word that means “wooden figure” or “puppet” but also “blockhead”, “fool”, or...
When Bakugo battles Deku, Kacchan makes it clear that he has respect for Deku, but he also hates him because he thinks All Might thinks highly of Deku. Kacchan is mad that Deku is getting realized by All Might, and not himself who is being recognized.
He explains that his real name is Izuku and Deku was a name given by Kacchan for being a bully, as it was an insult for not having powers. Noticing Ochako likes how Deku sounds, Midoriya is more than happy to go by the name, despite its derogatory meaning.
The Deku (デク, Deku?) are a recurring race in the Legend of Zelda series. They are a race of humanoid plant-like beings that often co-exist with other races.
Bakugou tells Midoriya he loves him (Bakudeku) [My Hero Academia Comic]
Midoriya and Bakugo may be on better terms but the one person in class 1-A who has proven to be Bakugo's best friend, is Eijiro Kirishima.
Bakugou, Kirishima and Hawks wears eyeliner.
The "U.A. Traitor" is revealed to be Yuga Aoyama. He was born Quirkless, and with his parents both coming from wealthy backgrounds, they made a deal with All For One to give him his Navel Laser Quirk in a desperate move to grant their son a happy, successful life.
2 Kirishima's The Traitor: Sitting on the Sidelines
Kirishima was not involved with the fighting that occurred during the League of Villains attack on the training session.
At the end of his and Izuku's fight against Nine, Katsuki lost One for All and the Quirk remained in Izuku's body.
Mitsuki hit on Masaru rather aggressively, making him say yes to a date. After a long time of chasing him, they eventually got married and had their son, Katsuki, sometime later.
Izuku was raised primarily by his mother Inko, who has the ability to make small objects float towards herself. His father, Hisashi, whose quirk allows him to breathe fire, is not seen due to him working abroad in the United States.
From Season 2 of My Hero Academia anime to Season 6 which covers chapters 22 to 328 of the manga, Bakugou is 16 years old. From chapter 328 to the final chapter 390, he is 17 years old.