Name: Natsuki Subaru

Age when he died on earth: 17

Age when he's an Oni child: 13

His looks:

Likes: Rem, the mansion, Kararagi, Emilia, Puck, Beako, Ram, Petra, avenging his fallen brethren.

Dislikes: The Justice system, The Knights, discrimination against demihumans, remembering his past, people hurting the ones he cares about(especially Rem), Roswaal.

Hates: The Knights, Roswaal, and The Witch Cult.

His weapons:

Chain-Spears/Kunai Rope Dart:

Subaru's signature weapon, he had learned how to use these weapons at the age of 15, and mastered it at 17. He uses these for long ranged attacks, to close the distance between him and his opponent, or to yank his opponent to him. He can also use them to swing around.

Blades: Now I don't know what his blades should look like or if he should just have a katana. I found good concepts for this.

Now you guys can vote on that. But yeah, aside from his chain-spears. Subaru carries one blade or two blades with him for close-range combat. He can also combine it with his yin magic for access to other techniques yin he has.

Now for his Abilities:

Oni Bloodline: As Subaru is an Oni, he can enter his Oni form, manifesting two horns on his forehead. Subaru like the rest of his race, has physical attributes that surpass that of regular humans. Enhanced Speed, Strength, durability, stamina(maybe??), etc. While manifested, an Oni's horns would awaken their instincts and act as a gate that allowed the Oni to absorb mana from the atmosphere, significantly increasing its ferocity and physical abilities. If an Oni over-exerted themselves while manifesting its horns, it was likely that the recoil would render them weak. Which is why Subaru only uses his horns as a last resort.

Mastery over Yin Magic: Now aside from the Shamak Spells, Subaru has enough mastery over his yin magic to where he can make his own techniques and moves.

(I'm guessing Beako made her own spells with Yin magic, seeing how the attribute is only used for debuffs.)

Shadow-Port: Subaru combined with using shamak, can poof out of existence and reappear somewhere else, like a substitution jutsu. He's so fast that it makes him look like he's teleporting.

Shadow-Clone: Subaru can use his Yin Magic to make clones himself to help him fight. He makes them from his shadow.

Yin-Chain Technique: If Subaru imbues his Chain-Spears with Yin Magic, then he has the ability to cause the affects Yin Magic would normally have on someone. Slowing them down, and sapping their strength.

Yin-Chain Technique: Uzumaki: The namesake of this technique involves said chain twisting the victim into a horrifying spiral, the move can also completely cut the victim off from their magic. Look at Junji Ito, and also shoutout to Ghostwolf2022 for the idea.

Shadow-Possession or Imitation: Subaru merges his shadow with an opponent's shadow. Immobilizing them and forcing them to mimic his movements.

Shadow Ball/Shadow Sphere:

Subaru uses his mana and gathers it in the palm of his hand. And starts to spin it rapidly in multiple directions in order to contain the mana in a spherical shape. The move grinds into whatever it makes contact with, doing extensive damage until the spinning mana dissipates. And with extension, the opponent experiences the affects of losing their senses, the strength in their body, and won't be able to use their mana for a good period of time.

Tsukuyomi: Subaru uses in combination with a few other yin spells to completely deprive his opponent with sensory feedback all the while his senses remain wholly intact and he can whale on the poor bastard stuck in this technique.

Divine Protection: ???????

(Don't know if he should have one)

Return By Death: We all know what that does. But for those who don't. It allows Subaru to go back in time to a point before his demise.

There are more moves he has but I won't cover them here. And that's his Bio. And while I'm also at it, let me cover his love interest.

His childhood crush: Rem

His love interest: Rem

And that's about it. Till next time. And if you have any ideas for techniques. Then I'm all ears.