Like arrow which it can use in bow, like potion which it look like lingering and splash potions and like trident which it can be throw and pickup too
#Custom Projectile
past trail
still zephyr
What is the question?
fervent veldt
If you want to shoot the projectile with the bow, just rewrite the MC arrow. A custom projectile is mainly characterized by the mc:projectile component. You can experiment with different values, projectile properties/objects (some projectile behavior is working only with proper entity format_version) and combine them with runtime_ids from existing MC projectiles.
I recommend you look into projectile files of vanilla BP/RP.