Just some ideas I had lying around
Gurenia
Stone-Linker, Mage, Female
Race: fire/water/earth/air/guem guemelite
Rarity: Legendary
Your other characters gain chain when they play a Linker spell.
After the 1st spell Gurenia has played during a fight, a Stone-heart of the same type is created and played during her next fight.
+1 spell damage for each of your tapped allies.
Turns 1, 3, and 4: Eahc of your allies gets Defense +1 till the end of the game.
Dassin The Dark
Stone-Linker-Zil-Courtier, Mage, Male
Race: earth/fire/shadow guemelite
Rarity: Uncommon
When you play a shadow spell, the opposing characters have Spirit -1 for the next turn.
When you play a Linker spell, your allies have Spirit +1 for the next turn.
Turns 2 and 5: Defense +2
Shuren-Oni
Kotoba-Demon Hunter, Warrior, Male
Race: War guemelite/Demon
Rarity: Uncommon
Attack +1 for each opposing demon.
If the opposing character in battle isn't a demon, you have -2 to damages suffered.
Turns 1 and 4: Spirit +2
"A Demon Hunter using the powers of a demon to kill other demons...interesting"
Anzieos The Black Dragon
Noz-Dragon knight, Warrior, Male
Race: Dragon guemelite
Rarity: Rare
Can play all Dragonic spells.
A Shape of a dragon from your deck is attached after you have played your cards.
The effects of Nehantic spells against Anzieos are reduced by 1.
Turns 1, 2 and 5: Attack and Defense +1
"He was born in the shadow of the Dragon's heart"