Seraphina

•Poseidon no Hoko: This is a lethal technique in which Poseidon creates a great whirlwind with his cosmos that envelops him and throws his enemy far away. He then raises his trident accompanied by enormous columns of cosmos, then throws his weapon with enormous force, which gains tremendous momentum during its trajectory towards his enemy until it impacts. Finally, upon hitting the enemy, a huge explosion is generated that engulfs the enemy. •Sea God Defense Wall: is a technique that consists of creating a wall made of Cosmos that reflects the attacks of opponents. •Tempest Noah: is a technique of Poseidon, in which he spins his trident above him, and then throws devastating blasts of his divine cosmos at the opponent. •Sea God Wave: is a technique that consists of launching powerful discharges of cosmic energy either through the hands or with the Trident of Poseidon. •Ground Rage: is a Poseidon technique, the god uses his Trident to summon a lightning bolt that falls violently on the ground at a certain distance from the god and his opponent. •Geyser: It is a Poseidon technique, the god uses his Trident to hit the ground causing a large amount of water to emerge from under his opponent, which hits him repeatedly. •Invisible Trident: It is a Poseidon technique, the god launches himself along with his Trident, which is surrounded by his cosmos against his opponent, impacting the latter.

•Poseidon's Trident: The Trident of Poseidon is a divine weapon owned exclusively and symbol of the Marine army of the Emperor of the Seas, Poseidon, one of the three main gods of Olympus. The handle is golden, and the three-pronged part is silver with golden ornaments. In the manga, it is worn with a long lilac or light blue ribbon wrapped around the top. The trident is the symbol of the return of the Emperor of the Sea, because in both cases in which this deity is presented alone, he has a rebirth, as when Kanon accidentally awakened Poseidon, having previously been presented with the Trident in the prison of the Sanctuary; also when Julian Solo assumed his role as king of the seas, it was as a consequence of finding the Trident.

She accompanies Degel to France to the Vouivre mansion where she is a guest for Lady Vouiver's birthday, after the defeat of Lady Fraille, Serafina tries to help her leave the mansion grounds but the carriage is ambushed by the Jewels and Serafina is brought before Garnet, Krest locks her up in order to lure Degel out, after the fight between Master and Student Dégel rescues Serafina, she returns to Blue Graad, it would be the last known time that Degel would see her alive. According to Unity, Seraphina died due to an illness, a cold that was aggravated by the low temperatures of the lands of Blue Graad. After her death, her heartbroken brother found the entrance to Atlantis and within it the Orichalcum, so he planned to expose Seraphina's corpse to Poseidon's power and waited for the day he could release her soul from the Vessel of Athena to take possession of his sister and revive her to rule the world with Poseidon's power and in the name of Blue Graad. However, Unity's plan to free Poseidon's soul did not come to fruition, so when Pandora shattered the Orichalcum crystal, the Orichalcum's power spiraled out of control and Seraphina's body was reanimated with that power due to the exposure her body was subjected to, without the will of Poseidon's soul to control that power. Because Serafina's body was bathed in the pure power of a god without a conscious controlling it, the sea began to collapse, causing that chaos to eventually reach the surface. However, Degel was able to stop Poseidon's power, and for a moment, Serafina reacted to Degel's caress, reviving for a few brief moments.

According to Dégel, she was very kind and her face was the living image of Unity's late mother and herself, Serafina spent her time seeking to save her people who were in frozen lands trying to negotiate with other countries with the intention of moving her people to lands where the sun rises. In Dégel's Gaiden it can be seen that she cares greatly for Dégel's well-being and that she may have feelings for him. In the end, after obtaining the power of Poseidon, Serafina lets out a smile towards Dégel before being frozen next to him, regaining her memories and feelings at the end of the battle.

She was slender, with platinum hair, and physically beautiful. Her face was the living image of Unity's deceased mother. After becoming the host of Poseidon's power, she donned the Scale of the Sea King in a feminine version that appeared to be created from Water, along with a trident and a white dress beneath the scale.