I was thinking on suggesting a One-Tailed form of Gaara since most of the Jinchuuriki have either Edo-Tensei or some alternative form that displays some of their Tailed Beast abilities.

Mystery: (Nin) [Giant Sand Coffin] Cause damage to up to 9 units in target's lineup while also causing knockdown and Immobile to target. If Target is a Ally, grant a Shield based off of 50% of this unit's Def and Res. Enter's Explosive Mode for one round
Standard: [Tailed Beast Tail Whip] (nin/tai Earth) Attack up to 5 unit's in the front row with a chance to cause Knockdown and Immobile
Chase: [Wind Release: Drilling Air Bullet] (Nin Wind) Chases Knocked Down, causes 5 Combo, Repulse, and Cancels Shields and Buffs
Passive 1: [Shukaku's Rage]: When Gaara get's debuffed or attacked, he gains a 8% increase to Def and Res each time he is debuff/attacked, but the Sleep Debuff lasts 2 rounds and can't be interrupted by Damage
Passive 2: [Jinchuuriki Sand Armor]:Gaara has Super Armor and Before First action each round, Generate a Shield equal to 25% Res to your lineup. During Explosive Mode Gaara gains a 30% increase in DEF and RES, heals himself by 20% of all damage he deals, and lowers his Mystery Cooldown by 1 after exiting Explosive mode but puts the Sleep Debuff on himself

the main idea was to make him a more defensive unit but to also give him a interesting interaction with the Sleep Debuff due to the Lore with it. Feel free to tweak any numbers or skills as this is just a rough draft idea for a unit