I really agree with like that entire post. Pika's EVERYTHING is useful. Except maybe skullbash (outside of recovery). His jab is ok, his tilts are fantastic, his smashes all have uses, his aerials cover a lot, and his B moves are Beautiful. ah, pika love.
Anyways, bair essay. Here's everything I love about bair. It comes out fast. I don't know the frame data, but its hitbox has to come out in the first 5 frames or something. Its initial knockback is pretty nice too if you hit early in its animation. Also, it lasts forever. Some see this as a drawback as you're pretty committed to it once you start it, and I'll agree, but I love just floating down with a bair. A lot of people will expect it to end early or not have as wide of a hitbox (since pikas aerials have pretty poor range) or expect to be able to beat it or something and will try to punish, only to get hit anyway. Its priority is kinda bad, but it will still at least trade with a decent number of things. You can slide a bit with it, which makes it easyish to ledge-cancel, but i personally don't use it for this much as if it hits it doesn't really ledgecancel into anything. I guess it makes the move safer though. Lastly, one of the main things i loooove about pika is when you land with it for a few frames you are really short. Like, almost jigglypuff crouch short. And fortunately the few frames that you are this short happen to be when characters can first grab after shielding it. You don't duck everyone's grabs, but any medium-height character will fail to grab you. This includes sheik marth and ganon, most notably. And after they whiff, you get to punish them, usually with your own grab or rising uair.
Also, we pikas have a compendium of pika knowledge, but really few people ask about it. I think because we're lolpikas, besides quick attack ledgehogs and uair spikes our stuff doesn't look that fancy/interesting.
Edit: Nice vids toasty. Made some interesting choices on occasion, and your dash dancing looks silly, but i thuroughly enjoyed the watch. Good stuff.