Yuta Okkotsu and Maki Zenin

Appearance
Young man of average height and slim build.
Black and somewhat disheveled hair.
Dark eyes with a generally calm expression.
He usually wears the Jujutsu sorcerer's uniform, although sometimes he wears a distinctive white jacket.
Personality
Kind, polite, and very empathetic.
At first he was shy and insecure.
He is willing to risk his life to protect his friends.
When he fights, he can become extremely serious and determined.
Skills
It possesses an enormous amount of cursed energy.
He is considered one of the most talented sorcerers of his generation.
He excels in sword fighting.
You can copy certain cursed techniques under certain conditions.
He has a great ability to use the reverse technique and heal wounds.

Appearance
Young, tall, and athletic woman.
Dark green hair (black in the manga).
Sharp eyes and a firm expression.
He usually wears special glasses that allow him to see curses.
She has a confident and self-assured posture.
Personality
Strong, disciplined and very hardworking.
Direct in her speech and intolerant of injustice.
He possesses great determination and pride.
Although she seems tough, she cares deeply for the people close to her.
Skills
He has extraordinary physical capabilities.
She is an expert in the use of cursed weapons.
He stands out for his speed, strength, and reflexes.
Her talent in hand-to-hand combat makes her one of the most dangerous fighters in the series.

In Jujutsu Kaisen, neither of them has a "Shinigami" like in Bleach. Perhaps you're referring to shikigami (creatures summoned through cursed techniques).

Yuta Okkotsu

Arms

He primarily uses a katana.

You can also use other malicious tools if the situation requires it.

Do you have a shikigami?

He does not use shikigami regularly.

His most important companion is Rika Orimoto, a powerful cursed entity linked to him. Rika can fight, store weapons, and assist Yuta in combat.

Maki Zenin

Armas Maki specializes in cursed weapons. Some of the most well-known are:

Cursed spears.

Naginates.

Cursed swords and katanas.

Walking sticks and other special tools.

One of the most famous is the Split Soul Katana, capable of directly damaging a target's soul.

Do you have a shikigami?

No. Maki does not use shikigami.

His fighting style is based entirely on his exceptional physical abilities and the use of cursed weapons.

Quick summary

Yuta: Katana + Rika Orimoto.

Maki: A wide variety of cursed weapons, especially swords and spears.

Shikigami: Neither of them is known for using shikigami as a main part of their fighting style.

If we imagine Yuta Okkotsu and Maki Zenin as a couple, they would probably have a relationship based on respect, trust, and mutual support.

Yuta would be the calmest, most attentive, and most understanding. He would listen to Maki when she had problems and try to help her without judging her.

Maki would be the most direct and firm. She would encourage Yuta to have more confidence in himself and no longer doubt his abilities.

They both share difficult experiences, so they might understand each other better than many other people.

In combat they would form a very effective team: Yuta contributing his enormous power and versatility, and Maki her physical ability and experience with weapons.

In their day-to-day lives, many fans imagine that:

Maki would be the one who takes the initiative most of the time.

Yuta would be more reserved, but very affectionate in important moments.

They would protect each other, although they would both argue about who should take fewer risks on dangerous missions.

They would have a fairly calm relationship, without too much drama, based on the admiration they feel for each other.

Of course, this is a fan interpretation. Jujutsu Kaisen doesn't focus on romance, so much of what their relationship would be like is left open to the imagination.

If we're talking about Rika Orimoto and Maki Zenin, their relationship would depend a lot on which version of Rika we're considering.

During the events of Jujutsu Kaisen 0

The original Rika was extremely possessive and protective of Yuta Okkotsu. Had she sensed that Maki was very close to Yuta, she probably would have felt jealous and might have reacted hostilely at first.

However, Maki wouldn't be easily intimidated:

I would speak to him firmly.

I wouldn't be afraid to confront her.

I would try to make him understand that he doesn't want to hurt Yuta.

After Jujutsu Kaisen 0

The situation changes drastically. The Rika who accompanies Yuta later on is more a manifestation linked to his powers than the original girl trapped as a curse.

Then:

Rika would probably recognize that Maki is an important person to Yuta.

Maki would treat her as a valuable ally in combat.

Both would share the same objective: to protect Yuta.

A scene that many fans imagine would be something like this:

Rika: "I'm going to protect Yuta!"

Maki: "Good, because I plan to do it too."

Rika: "So we're on the same side?"

Maki: "Sure."

Given their personalities, it is unlikely that they would be very expressive friends, but they could develop a relationship of trust and cooperation based on the affection they both feel for Yuta.