<p>Itona isn't a relation of Koro-sensei.</p>

<blockquote>
  <p>He is the son of Horibe Electronics Factory's former president. After his father's company went bankrupt, Itona was abandoned by him which became a source of bullying towards him as well. One night, he was found by Shiro who told him that in his eye lies a tenacity for power and that he would help him achieve that power in order to grasp victory.</p>
</blockquote>

<p>See more: <a href="http://ansatsukyoshitsu.wikia.com/wiki/Itona_Horibe" rel="nofollow noreferrer">http://ansatsukyoshitsu.wikia.com/wiki/Itona_Horibe</a></p>

<p>I presume the similarities lie in the tentacles. Itona's powers are manufactured by scientists, wheras Koro-sensei is an octopus alien.</p>

<p><img src="https://i.sstatic.net/ktSNTm.jpg" alt="enter image description here"></p>

CC BY-SA 3.0
2015-05-07T12:23:22.823Z
Ah I get it. Sorry I don't read the manga so I didn't know hehe.
enjeru
CC BY-SA 3.0
2015-05-07T12:26:47.423Z
No problem :)  it's a good read
Toshinou Kyouko
CC BY-SA 3.0
2015-05-07T12:29:43.397Z
@ToshinouKyouko well if you actually read the latest grey area translations, it's revealed that Koro-Sensei actually *isn't* an alien......
Vogel612
CC BY-SA 3.0
2015-05-07T12:38:11.117Z
@Vogel612 :o I haven't read it since the anime started. Feel free to post a better answer :)
Toshinou Kyouko
CC BY-SA 3.0
2015-05-07T13:01:20.203Z
@ToshinouKyouko your answer as far as Itona and Koro-sensei's relationship is 100% correct as far as we know from the manga, so I don't think the answer needs improving per se.
Daboyzuk
CC BY-SA 3.0
2015-05-07T12:08:48.530Z
2015-05-07T12:08:48.530Z
Toshinou Kyouko
<p>As @Toshinou Kyouko explained, Itona and Korosensei aren't actually related.</p>

<p>Koro-sensei was...</p>

<blockquote class="spoiler">
  <p> ... originally the subject of human experimentation. His powers are the result of the experiments that were run on his own body.</p>
</blockquote>

<p>Itona is considered being Koro-sensei's brother because...</p>

<blockquote class="spoiler">
  <p> ... he received his tentacles from the same scientists who experimented on Koro-sensei. His powers are inherited from Koro-sensei.</p>
</blockquote>

<hr>

<p>As for why they don't look alike:</p>

<blockquote class="spoiler">
  <p> Itona had his tentacles implanted into him. Those tentacles were most likely originally part of Koro-sensei's body after the latter turned into the octopus we now know and "love". Unlike Koro-sensei, his body didn't actually change.</p>
</blockquote>

CC BY-SA 3.0
2015-05-07T13:56:10.163Z
2015-05-07T13:56:10.163Z
Nolonar
<p>Koro-sensei and Itona are not blood related at all, it's the tentacles that make them both fall in the same category "family".</p>

<p>This brother relationship was first mentioned by the official guardian, as to make Itona confused about his relationship with Koro-sensei. He intended to kill Koro-sensei with the help of an enraged Itona, but as obviously failed. </p>

CC BY-SA 3.0
2018-01-02T16:59:41.340Z
2018-01-03T02:02:35.543Z
2018-01-03T02:02:35.543Z
Varun
<p>Koro sensei was actually human once , he was formerly the reaper before his apprentice turned him in and stole his name, he was then experimented on by shiro and grew the tentacles after escaping the facility and killing his best friend and destroying the facility. </p>

CC BY-SA 4.0
2019-05-28T19:59:40.590Z
Please include relevant sources/references. If possible, avoid repeating information from previous answers.
W. Are
CC BY-SA 4.0
2019-05-28T16:22:10.250Z
2019-05-28T16:22:10.250Z
user47435
<p>When I watch the anime I get excited by Koro-Sensei's new student, Itona. He has many similarities with koro-sensei. So, my question is: why do they look different? Koro-sensei is like an octopus and Itona is like a human. </p>

CC BY-SA 3.0
2015-05-07T12:10:17.327Z
Your question doesn't mention a Tako? did you mean Itona in the title?
Toshinou Kyouko
CC BY-SA 3.0
2015-05-07T12:24:42.303Z
Yeah hehe. I mean why Itona didn't look like tako(octopus) like koro-sensei. @ToshinouKyouko
enjeru
CC BY-SA 3.0
2015-05-07T12:25:10.667Z
Ah I see now :)
Toshinou Kyouko
CC BY-SA 3.0
2015-05-07T12:26:25.677Z
hehe. Sorry I make you confused :p @ToshinouKyouko
enjeru
<assassination-classroom>
Why is Koro-sensei's sibling Itona not like him?
# Why is Koro-sensei's sibling Itona not like him?
Posted by: username_0 on 2015-05-07
When I watch the anime I get excited by Koro-Sensei's new student, Itona. He has many similarities with koro-sensei. So, my question is: why do they look different? Koro-sensei is like an octopus and Itona is like a human.
**Tags:** assassination-classroom
> **Comments:**
> **username_1**: Your question doesn't mention a Tako? did you mean Itona in the title?  
> **username_0**: Yeah hehe. I mean why Itona didn't look like tako(octopus) like koro-sensei. @ToshinouKyouko  
> **username_1**: Ah I see now :)  
> **username_0**: hehe. Sorry I make you confused :p @ToshinouKyouko  
---
## 4 answers
### Answer by username_1 on 2015-05-07. Score: 3 | Accepted answer
Itona isn't a relation of Koro-sensei.

> He is the son of Horibe Electronics Factory's former president. After his father's company went bankrupt, Itona was abandoned by him which became a source of bullying towards him as well. One night, he was found by Shiro who told him that in his eye lies a tenacity for power and that he would help him achieve that power in order to grasp victory.

See more: <http://ansatsukyoshitsu.wikia.com/wiki/Itona_Horibe>

I presume the similarities lie in the tentacles. Itona's powers are manufactured by scientists, wheras Koro-sensei is an octopus alien.

![enter image description here](https://i.sstatic.net/ktSNTm.jpg)
> **Comments:**
> **username_0** (2015-05-07): Ah I get it. Sorry I don't read the manga so I didn't know hehe.  
> **username_1** (2015-05-07): No problem :)  it's a good read  
> **username_2** (2015-05-07): @ToshinouKyouko well if you actually read the latest grey area translations, it's revealed that Koro-Sensei actually *isn't* an alien......  
> **username_1** (2015-05-07): @Vogel612 :o I haven't read it since the anime started. Feel free to post a better answer :)  
> **username_3** (2015-05-07): @ToshinouKyouko your answer as far as Itona and Koro-sensei's relationship is 100% correct as far as we know from the manga, so I don't think the answer needs improving per se.  
---
### Answer by username_4 on 2015-05-07. Score: 4
As @Toshinou Kyouko explained, Itona and Korosensei aren't actually related.

Koro-sensei was...

> ... originally the subject of human experimentation. His powers are the result of the experiments that were run on his own body.

Itona is considered being Koro-sensei's brother because...

> ... he received his tentacles from the same scientists who experimented on Koro-sensei. His powers are inherited from Koro-sensei.

---

As for why they don't look alike:

> Itona had his tentacles implanted into him. Those tentacles were most likely originally part of Koro-sensei's body after the latter turned into the octopus we now know and "love". Unlike Koro-sensei, his body didn't actually change.
---
### Answer by username_5 on 2018-01-02. Score: 0
Koro-sensei and Itona are not blood related at all, it's the tentacles that make them both fall in the same category "family".

This brother relationship was first mentioned by the official guardian, as to make Itona confused about his relationship with Koro-sensei. He intended to kill Koro-sensei with the help of an enraged Itona, but as obviously failed.
---
### Answer by username_6 on 2019-05-28. Score: 0
Koro sensei was actually human once , he was formerly the reaper before his apprentice turned him in and stole his name, he was then experimented on by shiro and grew the tentacles after escaping the facility and killing his best friend and destroying the facility.
> **Comments:**
> **username_7** (2019-05-28): Please include relevant sources/references. If possible, avoid repeating information from previous answers.  
---
