Name: Jaune Arc (Formerly), Jaune Arc-Angelo Sparda (Current) Vergil Sparda (Cover)

Personality: Kind, caring and friendly to all his friends, a very strategic person, hates bullies (Formerly)
New personality: Brutal to his enemies with a chance to mock or taunt them in battle, hates bullies, kind to his friends, smart, a great tactician in battle

Likes: His team, Team RWBY, Team CFVY, Ozpin, his girlfriend Ciel Soleil, chocolate Sundays, chocolate cake, Pizza, sweets, strong opponents, power, being motivated, training, poetry, his sisters, meditating, faunus and a good sleep.

Dislikes: bullies, racists, people insulting his friends, the White Fang, Team CRDL, idiots and his father.

Outfits:
Casual

Desert

Formal

Battle Armour

Weapons:

The Yamato

Named after a god of death, this was the very blade that Sparda used to separate the human and demon world. The blade was once Vergil's primary go to weapon, now it's Jaunes.

Beowulf

Another Devil Arm that Jaune inherited when he awakened his demonic ancestry. Jaunes motivation to get stronger lead him to constantly practice with his newfound abilities and weapons in an attempt to surpass his ancestors and make them proud.

Mirage Edge/ Summoned Swords

Using some of his demonic power, Jaune is capable of summoning a ghostly blade that he can use in battle as either a sword or as a projectile. Using different styles affects the way the blades act. Jaune can also expend some of his power to use the blades in different ways while using the darkslayer style. He can also use the blade in a means similar to a grappling hook to help better traverse the environment.

Styles:

Darkslayer - a style fitting for a warrior that's fallen from grace. Using his demonic energy Jaune is able to teleport around the environment to give himself a better tactical advantage in battle, he can also pool his demonic energy into his feet to perform a double jump and a lunge in mid-air to boost himself forward.

Devil Triggers:

Doppelganger Devil Trigger

Using the demonic power granted to him by the Yamato, Jaune is able to create a ghostly copy of his Sin Devil Trigger. Eventally, Jaune will be able to use his own natural demonic power to use this ability

Devil Trigger

Through constant training, Jaune was able to unlock his Devil Trigger. Will lose it when he unlocks the SDT.

Sin Devil Trigger

He could only hold this form for a minute at best but with time and practice he'll eventually be able to hold the form indefinitely.

Eikonic Devil Trigger/Titan Devil Trigger

After unintentional absorbing some of the Relic of Destructions magic and fusing it with the Yamato, Jaune gains access to a brand new form. Sacrificing his usual skills and abilities for overwhelming power, Jaune now wields the power to utterly annihilate The Brother Gods and the world in one move.
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I will add more as the story progresses so don't be afraid to give me ideas. Anyway updates will come when I feel like updating so no promises.