Entity without a hitbox

Hey, i'm making a mod that adds a shield hability that resembles the one from Sonic, i made a custom entity that follows the player while they're shielded as a visual for shielded players. How could i make the entity have no hitbox but be visible? I tried setting the bounding box to all 0's but it just becomes invisible. I want it to be visible, but have no hitbox so it doesn't interfere with the player's actions like combat, building, etc. How could i do this?