"Eh? No no, I don't know anything about that."

Name: Arthur (no last name)
(Real name: Cosmos)
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Gender: male
Pronouns: he/him
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Age: 67  -  (real age: 5000+)
Birthday: April 26th
Zodiac sign: Taurus
(Extra Information: Birthstone: Tiger's Eye)
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Species: Sentient Pendent/Inter-dimensional Demon/Sealed Demon
(Species they pretend to be: Human)
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Height: 6'3"
Weight: [Can easily be picked up due to how light he is.]
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Sexuality: Pansexual
Main crush: Stanford Pines
(Trope with crush: Friends to Lovers) + (also turns to Enemies to Lovers at some point-)
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Personality: [Despite being an inter-dimensional demon like bill, his presence is said to be rather calming due to his nature to help others..but of course, he's a demon like bill, so he's only acting nice to distract you from what he's actually planning. While in his human form, he is practically the same, but unlike his original form, he actually acts human due to the many years he spent with the species. Cosmos tends to attach himself to people that he actually finds interest in, this could be emotionally, or the person was actually pretty interesting, when he attaches himself to someone, he turn into human form and would try his best to become their friend to get to know them more.]

Phobia: Necrophohia (Fear of dead things) + (despite being a demon, he doesn't like the sight of dead things)
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Likes: learning about recent history, trying human food, the many creatures in gravity falls, helping others, small animals(he finds them silly), traveling, beautiful scenery, chatting with people, and reading.

Dislikes: feeling human pain(it's not fun), being asked why he wears sunglasses, not being trusted(doesn't want to be sealed again), being alone, bland places(places with no detail to it), being asked too many questions, being rushed, and restrictions.
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Abilities(since he's a inter-dimensional demon):
-Body transformation or Body Transference (Body transformation: able to change his body into whatever species) + (Body Transference: swap bodies with someone)
-Telepathy (can talk in someone's mind)
-Body transformation Pt.2 (able to change his true form to look like a different type of star, since his true form is that of multiple stars in one)
-Day and night manipulation (able to change the time/day and night of a certain area.)
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Backstory: [Cosmos has been around since ancient Egypt times, but was probably around for longer. When he arrived in Egypt, he was immediately treated as a god, and due to this, Cosmos would help the people by giving them advice or controlling their bodies, but, one day, someone would discover that cosmos was doing evil deeds that would harm the people Egypt, due to this, a ritual was done on the demon and would be sealed away in a pendant. Many years have passed and Bill would come across the pendant, since he knows basically everything in the world, he was well aware of what the deal with the pendant was, so he would keep it, that would he until he would be summoned by Stanford Pines. One day, when Ford was doing research, Bill would give the pendant to him as a gift, Ford was completely unaware of the pendants origins or that a demon was sealed in it. When Ford accidentally fell into the portal that he made, he would come across a human that would be in the world as well..he still doesn't know how they ended up there..but all he knows is that he's the only person he could actually trust there...while traveling with this person, he would begin to hear voices in his head that would guide him..he knows it couldn't be bill because he cut his connections with them.]
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Appearance(True form):

Appearance(first meeting Ford):

Appearance(Appearance now):