Are There Any JJK Characters In FF Crossover Events?

Gwyneth Windsor spent her entire life trying to "function normally," but this hard-won, delicate pattern is instantly shattered when she is mysteriously pulled into an infinitely complex interstellar empire. She must suddenly learn new common sense in a world where near-immortal shifters view anyone under 100 as a minor. To her confusion, Gwyneth, despite her adult body, becomes the empire's most coveted 'BABY.' Luckily, she finds a doting family that spoils her utterly, even securing her the lordship of a small, 12-planet galaxy. Yet, Gwyneth's arrival is no accident. While Gwyneth navigates the absurdity of being a pampered 'minor' in an adult body, the universe itself is in peril. Emperor Alaric Lykos, the last of the powerful Royal Fenrir Clan, is the sole anchor of the universe. An ancient prophecy warns that if his line falls, all will collapse. Though pressured to marry, the Fenrir Clan's unique bloodline will only settle for its destined bond, a soulmate whose identity has remained a ghost in the cosmic radar... Until now.

Evy was a simple-minded girl. If there's work she's there. Evy is a known workaholic. She works day and night, dedicating each of her waking hours to her jobs and making sure that she reaches the deadline. On the day of her birthday, her body gave up and she died alone from exhaustion. Upon receiving the chance of a new life, she was reincarnated as the daughter of the Duke of Polvaros and acquired the prose of living a comfortable life ahead of her. Only she doesn't want that. She wants to work. Even if it's being a maid, a hired killer, or an adventurer. She will do it. The only thing wrong with Evy is that she has no concept of reincarnation or being isekaid. In her head, she was kidnapped to a faraway land… stranded in a place far away from Japan. So she has to learn things as she goes with as little knowledge as anyone else. Having no sense of ever knowing that she was living in fantasy nor knowing the destruction that lies ahead in the future. Evy will do her best to live the life she wanted and surprise a couple of people on the way. Unbeknownst to her, all her actions will make a ripple. Whether they be for the better or worse.... Evy has no clue.

A thirty-year-old office lady, who got into an accident and is now trapped inside a novel series she loves. She was reincarnated into one of the side character extras of the story and meets in person the tyrant magician, the playboy prince, and the clueless female lead of the story.

It happened all of a sudden. Humanity received a trial from the gods. They were given blessings but fought for their lives. A goddess aims to hinder the gods for her own goals. But her power was not enough. An entity called the Void Contract appeared before her. It was a being shrouded in mystery, even among the gods. But in actuality, the Void Contract may be more human than one expected. He's quite a bit of a mischievous bastard himself.

'Even if the situation is too difficult, i would be crossing the distant fate with you' Hyomi is a journalist with a firm opinion trapped in a love hate-relationship with a superstar named Jun who turns out to be in the same group as Kai, her ex—He secretly still has feelings for her. And they trapped in a complicated love triangle that's impact on the growth of their group. A big bomb happened as fanatic fans sniffed out Hyomi and Jun's closeness. She's gets a lot if terror.

Serra is a normal senior high school student who works really hard every night and weekend to pay off her parents' debts from loan sharks. But when she couldn't keep up with payments anymore, she decided to end her life. Surprisingly, she woke up in a different light-- in another world. What's more shocking was when she is addressed by one of the people as the demon king's bride.