Mason(Dipper) Constance(Lies) Gleeful(Cipher)
Brother of Mabel
Controls the power of two Dream-Demons, Bill Cipher and Will Rehpic
Adopted by Bill to be his heir

Mabel Star Gleeful
Sister of Mason
Only controls the power of one Dream-Demon, Will Rehpic

Bill Cipher
Dream-Demon

Will Rehpic
Dream-Demon

Bill Cipher and Will Rehpic
Human form

Pacifica Northwest

Gideon Pines