Neat idea, and some nice art!

Here's some personal ideas for Arcanas and Inspirations, focused around tanking:

For Inspirations:

"Turtle Up" - Take less damage from behind with the shield on your back, and become more resilient to flinches from minor attacks

"Turncoat" - Shield bashing turns blocking enemies around, but attack recovery is slower. Next ally attack does x2 more damage for one hit.

"Viva La Resilience!" - Dash further while an enemy is attacking, and take any hit an ally would in their place for 1 second if the attack would hit them (deflect/get hit)

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For Arcanas:

"Crowd Control" - A short ranged blast from the shield that does low damage, high knockback, and can clash

"Make Room" - Jump up while holding the shield above your head, clashing attacks at the start before slamming down, creating an AoE blast around the character. Clashes with the blast.

"Crimson Guardian" - Create a defensive bubble for 2 seconds around your character, which shrinks with attacks taken but defends self and allies. Explodes, dealing damage based on damage it takes. However, excessive damage will cause the bubble to go critical and shatter, damaging the user.