Boomerang:

Make it larger and when it begins to come back make it still move a bit in the direction it’s about to go in rather than stop altogether. If you wanted to add some realism as well you could make GLK move back / charge up the boomerang before throwing. When you throw something hard you get a lot of swing into it and so you sort of move back slightly and quickly thwip back to a movement where you’d be throwing said thing.

Knife:

It looks reasonably okay, like I just said, adding some slight build up rather than a simple throwing out motion might make it more realistic. Make it spin less and move faster along with making it move slightly up as the throw was a sort of underhand throw so it would steadily incline before declining as gravity pulls it back down.

I’m no great animator or expert with these things so that’s just my take on it.

i don’t play too much fighting games myself, but what you should focus on for the animations should be speed and exaggeration, as it’s necessary to keep the gameplay fun and fast-paced, as fighting games do tend to require faster movesets

think of it from a gameplay standpoint beforehand rather than an animation standpoint, you wouldn’t want to play the character who has clunky animations that last for too long, leaving you open to any attacks from an enemy with a faster moveset

playing a character with flashy and fast moves that can allow you to essentially create really cool combos through different techniques is what makes fighting games fun, at least for the few times ive played them

if the main concern here are the projectiles (which are moving awfully slow), i think it’s best to change the focus more towards improving gameplay rather than just being a generic sticknodes reskin of tekken with clunkier moves

it’s time for me to actually criticize the animation
exaggerate the boomerang throw, it looks weak and just looks like it gets suspended in the air rather than being an actual projectile one should avoid, make it faster and more dynamic

knife throw should be quick and instant, something like a dagger or a bullet trail being thrown right after the throwing animation, something like how a ninja would throw daggers or something like that
don’t let it spin, it lacks any sort of energy and makes it look less of a threat than it should be

just look up references on youtube or try playing some fighting games yourself if you’ve never really experienced them before