You should read the manga. His hair turned white because of the stress of being tortured 2 or 3 times everyday for 10+ days.
The anime is wrong. Why? Because Kaneki's hair didn't change in a moment, in the manga they show us his hair gradually turning white while he also loses his mind.
They don't explain why the hair turns white or the nails black (...
√A ("root A") is a reference to and pun on the Aogiri Tree organization, which is the focus of the second season. "A" is simply the first letter of the organization, and the root is a pun on tree root (since it's the Aogiri Tree).
It looks like it's from Tokyo Ghoul. They've all got eyes like that:
It looks like the characters from your screenshot are Kurona Yasuhisa and Nashiro Yasuhisa:
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The DVDs will be uncensored.
They are not fully released yet (Volume 3 is coming out on the 28th of November, Volume 4 December 26th ), nor released in English speaking territories.
I expect it may take another few months before it is picked up by English licencors (streaming rights have been purchased, but DVD rights aren't up for grabs just yet).
In episode 12 of the anime, it is explained in detail.
His dad died before he was old enough to form memories
His mom died from "overwork" trying to support Kaneki and her younger sister
His aunt (which took advantage of his mom) is obviously not the responsible type
As far as the anime goes, Kaneki does not have any other family. As a result, anyone that ...
There are four different kagune types, which depend on kakuhou position in body:
Ukaku - fast kagune, capable of distant attacks, but ukaku ghouls get tired quickly due to RC cells depletion;
Koukaku - high density kagune, heavy, hence slow, but with high defensive capabilities;
Rinkaku - flexible kagune in form of tentacles, good for close combat offense, ...
As you know, ghouls have very strong muscle and high regeneration abilities. A ghoul's body can be damaged by Quinque or Q bullets.
The main requirement to kill a ghoul are weapons like those mentioned above and critical damage to a ghoul's body that even their regeneration abilities is not enough to keep them alive.
As stated here regarding the weaknesses ...
First of all, Suzuya did not use just any knives, he used a bikaku quinque in the form of knives, the Scorpion 1/56. Thus, since they are made from kagune, these knives can pierce ghoul skin and thus cut Kurona and Nashiro.
Scorpion 1/56 (サソリ1/56, Sasori 1/56) is a bikaku quinque that takes the form of a switchblade. They are currently wielded by Juuzou ...
It seems that his hair turning white and his nails turning black was both due to the physical and mental stress he was experiencing during the torture and the forced regeneration of his toes. (Sources: one, two, three)
The whitening of the hair due to stress is also known as Marie Antoinette Syndrome. The condition got its name after Marie Antoinette's hair ...
The song that plays at the end of episode 12 is the same as the opening theme song. It is called "Unravel", and is by TK.
Lyrics and more information can be found on the Tokyo Ghoul Wiki.
The full version of the song can be heard on YouTube.
The kakugan are red due to the activation of RC cells in the ghoul's body. The RC cells are present in their bodies are when they activate them to use their kagune of due to them becoming excited, the kakugan activates as well.
A kakugan is an influence of activated Rc cells.
The kakugan are red as the RC cells are red in colour.
Rc cells (Red Child ...
Start from the beginning, they've changed some things in the anime.
(Not to mention that the 2nd season deviated from the manga completely)
It's weekly, and do note that after Tokyo Ghoul, there's Tokyo Ghoul:re.
My interpretation was that it was purely symbolic. I saw the white hair as a change in his personality, a sort of draining of his "color" or original personality. When his hair changes back, we see some of his old self coming back.
Keep in mind that writers don't necessarily make those sorts of decisions with medical backing. Pure symbolism is often a very ...
Sadly, anime sacrifices a lots of plot details from manga in sake of 12ep seasons, so numerous things are just not explained. I've abandoned anime at around half of first season, so I will reference manga as explanation.
In a nutshell, main reason why Yomo stopped Touka was because he didn't wanted her to be killed indeed. He referenced this as "his last ...
There are in fact ghouls outside Japan.
There's the Chinese terrorist organization, Chi She Lian
There's also a group in Germany studying ghouls, Ghoul Forschung Gesellschaft
There's also ghouls from Russia, e.g., Donato Porpora
In a nutshell, investigators of different ranks hold different weapons and have more skill in fighting. The rank determines an Investigators' level of responsibility in the CCG, access to high-risk missions and high-rated targets. In addition, the rank also determines the salary of the investigator and it also shows different factors of experience they may ...
Here's my updated answer, with facts from the manga itself, since the manga has long been over and the answers here might still confuse someone, especially since the anime skipped some of the facts I'm about to present.
To start with, the difference between sex and gender is that the former is biological (male or female) and the latter 'can refer to either ...
There are plenty of reasons why any figure would hide his identity. Manga is a big deal in Japan and thus many authors try to hide their identity, especially before they are popular. On a side note, I've heard that a lot of Japanese are uncomfortable being a public figure and want to keep their private life private. 
Some of the reasons ...
Yes, it's shown clearly in the anime that
They started giving hints about it in first half of the episodes in Season 2.
Season 2 Episode 1
Season 2 Episode 2
Season 2 Episode 3
Season 2 Episode 7
Season 2 Episode 11
If you look at the word for ghoul as it's written in the title of Tokyo Ghoul, you can see that there's both kanji and furigana (pronunciation) for it. The furigana is グール, which the katakana word for ghoul. It's a phonetic loanword, pronounced guuru, which (based on the Japanese Wikipedia page for it) seems to have been taken from the English "ghoul", which ...
Root A (season 2) is a completely different storyline that diverged from the manga and shows Kaneki if he had joined Aogiri instead of going off on his own. Though it does have some big spoilers, Read a bit about why they made this decision on This question. Almost the entirety of Root A is different, but some scenes (mostly fights) are recreated and are ...
The whole show was highly censored, as shown in this comparison album (Obviously spoilers):
The main reason is Japanese censorship laws, which are very different from laws in the West, but some people have mentioned that S2 was airing at the same time as some ISIS attacks took place, thus this might have something to do with TV ...
The mask covered Kaneki's nose and mouth. This helps him suppress his urge to eat the opponent by reducing his ability to smell. Remember that Kaneki's ghoul ability is originally Hanazawa Kana's...no wait...Rize's, nicknamed the Glutton for her great hunger.
By suppressing this urge to eat, he can concentrate more on the fight as he's not worried about ...
Unlike stated in some of the other answers, it's not Marie Antoinette Syndrome. In the Tokyo Ghoul Re: manga, it is explained in Chapter 131: because the bodies cells are only able to divide a certain number of times before they fail, aka Ageing.
As Kaneki had to repeatedly heal his toes over and over and over, all the while being tortured and borderline ...
It's inaccurate to say it completely deviated from the manga. I read the manga first until the end as Tokyo Ghoul aired. Spoilers ahead.
There are two points to note here.
First: Kaneki, both in the manga and anime, looked for the same thing: the strength to protect his comrades.
Second: This makes most sense when taking into account the impressive and ...
Tokyo Ghoul:re is the sequel manga to Tokyo Ghoul. The Tokyo Ghoul manga ended in September of 2014 and was adapted into the first 2 seasons of the anime, though the second season, Root A, greatly diverged from the manga with significant differences but still attempted to have the same major events as the manga.
You can read about possibilities of why they ...
Most likely, it's a mistake.
If it isn't, it could be a sign of weakness. Eyes manifest on extremely RC dense Kagunes like kakujas, and I believe the kakugan is when RC cells enter the eye and turn it black due to concentration.
Since his eyes aren't black while his Kagune is manifested, it means he doesn't have enough RC cells in his body to manifest ...
His change in hair color is probably due to Marie Antoinette syndrome, a rare condition that causes the hair to suddenly become white in response to some great stress or shock. It's so named because Marie Antoinette's hair supposedly turned white after she was captured during the French Revolution.
Here's Wikipedia on Marie Antoinette Syndrome.
Here's a ...