Here is a list of the taken Godtier's

Time
Heir of Time
Knight of Time ~ Dave Strider (Taken)

Rage
Maid of Rage
Bard of Rage ~ Gamzee Makara (Taken)

Heart
Witch of Heart
Mage of Heart
Prince of Heart~ Dirk Strider (Taken)
Knight of Heart
Rouge of Heart ~ Nepeta Leijon (Taken)

Life
Knight of Life

Breath
Rouge of Breath
Page of Breath ~ Tavros Nitram (Taken)

Blood
Witch of blood
Sylph of Blood
Heir of Blood
Seer of Blood ~ Kankri Vantas (Taken) (Read more about Kankri to know why he is the Seer of Blood)

Light
Knight of light

Doom
Page of Doom

Mind
Sylph of Mind