So is Fox's, Falco's Reflector - it's apparently both a reflect and projectile -, Thunder, fully charged Charge Shot, Aura Sphere, Sun Salutation, Shadow Ball, Thoron?, and Water Shuriken; I think Bowser's Fire Breath and Charizard's Flamethrower are too, but I don't know if they're considered projectiles along with Rosalina's default Star Bit. Someone mentioned that Link's Quickfire Bow and Toon Link's Piercing Arrows were transcendent, bit I'm not sure on them. Ness's PKT custom is also transcendent, right? The one that functions like Lucas's? I think Sheik's Needles are transcendent too along with Robin's Arcfire and Zelda's Din's Fire it's not.
Stuff that isn't would be Mario and Luigi's Fireballs, uncharged stuff listed above, Gordon, Header, default PKT, Missiles, Phantom Slash, Vegetables, Lloid Rockets, Villager's Dash Attack and Slingshot?, PK Fire, Dr. Mario's Pills, Wario's Bike, the Link's Bows?, Can, Clay Shot, Wild Gunmen?, Pikmin, Bonus Fruit, Paralyzer, Thunder Jolt, Mega Man's lemons, Metal Saw, and Sonic.
I'm not sure on Villager's Tree and Bowling Ball, Crash Bomber, and a bunch more I probably don't know and don't remember.
Clanking Luigi's Fireballs doesn't stop him from running in and grabbing you, clanking Pikachu's Thunder Jolt is pretty much a waste of time considering Pikachu's fast and can throw out more TJs, while transcendent priority on Falco's does not really matter with the end lag. Shielding, avoiding, and even getting hit by his lasers even from across the stage is still punishable to Falco. The good thing about Falco's Blaster is because you can't clank it, then that means it's an annoying projectile to deal with off stage. But the on-stage game of pressuring from afar even if it's like Luigi's Fireball travel distance is something Falco would really like.