Gravity falls, Tokyo raven, and other

What if Bill was a set of 3 siblings

Ford took his other siblings before being sucked into the portal

What if dipped and Mabel are those siblings

This follows the idea of trinity
Mind, body, spirit

Mind, Bill

Body Mabel

spirit dipped

Bills triangle form came because his real body is sealed and can't in seal it until his siblings help him

Powers are

Mable has Powers over the physical world, her powers being alchemy from full metal alchemists

Dipped powers are of the spirit world, life and death are under his control. His powers are magic from Tokyo raven, and fairy tail

The story starts 3 years after final Canon episode

Dipped and Mabel powers start showing

Then when the gang, and other zodiac members are together

Bill appears, and with his siblings near him, takes his true form, but also Mabel and dipped takes their true forms as well

For bill, think anodite from Ben ten, but in gold

Mabel, she looks more human, but her eyes are shifting symbols for alchemy

For dipper, normal body shape and size, but looks like a night sky

They work together with the cannon people,

Because their is a greater threat, devils, and fallen gods coming to take over the world

WAIT, BILL DIPPER AND MABEL ARE NOT DEMONS, THEY ARE ELDER GODS OF MIND BOY AND SPIRIT

Dipped strongest with his powers, but physically weak

Mabel, physically strongest, but can be beaten by her siblings

Bill, the eldest and middle ground, not as strong as dipper, but still out up a fight

Cannon people gain powers from them

From Mabel gain alchemy

From Bill mind powers

And from dipped one form of magic

Yaoi

Billdip

Mabel x male oc, minor God of elements