Yugi Tsukasa/Relationships

Yugi Amane
Tsukasa is Hanako's younger twin brother and the person he killed.

While Hanako feels considerable guilt over killing him, Tsukasa doesn't seem to bear any ill will towards his brother for it, though he doesn't hesitate to use it as leverage to manipulate the latter. He's always eager to meet up with Hanako, greeting him with huge smiles and hugs. He tells Hanako he loves him and asks to play together just like they used to. They have both been shown to react negatively to others interrupting their reunions. It is implied in the story and theorised by fans that Tsukasa abused Hanako.

The twins seem to have been close since they were young and often did activities together, such as watching TV and going to festivals. They are shown to be holding hands in a commemorative photo taken upon entering junior high.

As supernaturals, Hanako and Tsukasa have opposing beliefs - Hanako maintains the correct relationships between humans and supernaturals, while Tsukasa thinks they should just be however they want. In a conversation with Nene, Tsukasa describes themselves as being polar opposites and compares their current relationship to that of rivals or arch-nemeses.

Nanamine Sakura
Sakura made a contract with Tsukasa and has become bound to him; similar to Nene with Hanako. She treats him like a little child and would become exasperated if he does anything unnecessarily cruel. Despite this, she cannot disobey his wishes and still aids him in altering the supernatural's rumors. She acts as his assistant, broadcasting his altered rumors to the student body. When conversing with Nene about him, Sakura says that Tsukasa never listens to her, his actions make no sense, and he has no sense of personal space.

She then says that there is nothing she can do about it and that she decided to think of him more as a cat than a person.

Tsukasa seems to hold some respect for Sakura and will alter his actions to a certain degree once reprimanded by her. This is shown when she advised him to be nicer to ladies. When it was time for him to knock out Nene, he refrained from slamming her to the ground, opting for a less-violent method.

Mitsuba Sousuke
Sometime after his death, Mitsuba made a wish to Tsukasa to not be forgotten by people, however, the wish was too unclear for him to be able to make anything but a weak supernatural form for Mitsuba, which he then used to haunt the school lockers in order to speak to his schoolmates.

After Mitsuba's real wish was drawn out thanks to his involvement with Kou, Tsukasa took advantage of the vagueness of the wish and twisted the rumors about him, turning him into "The Bent-Neck Boy at the School Entrance". This altered, monstrous form is more powerful but has also lost the humanity that Mitsuba once had.

In the Mirror Hell Arc, it was revealed that Tsukasa had created Mitsuba using an amalgamation of body parts he found as well as part of his original soul. This newly formed "Mitsuba" has the same personality but does not retain any of the original's memory. Tsukasa then gifted him with a brand new scarf that is dark brown in color. Tsukasa appeared later to save Mitsuba when he was in danger from Number 3. He also pressured Mitsuba into consuming Number 3's heart in order to gain power, trying to force it down his throat at one point. He seems to view Mitsuba's new power with child-like fascination, attempting to rope him into fighting Hanako three times.

Yashiro Nene
It is unsure of what Tsukasa actually thinks of Nene, but more so, she's an obstacle against his goals including her close relationship with his brother. In the Tea Party arc where they kidnap Nene and drown her within the boundary, their relationship can be described as vague where Tsukasa becomes curious by Nene when they both meet directly. However, in the Hell of Mirrors arc, when Nene attempted to stop Tsukasa from harming Mitsuba, he outwardly hits her before picking her up, saying girls shouldn't be treated that way.