Somehow I find your PSAs kind of boring. I mean, even though this one and the Metaknight one are your first PSAs, it is about the same as just manually putting all of the other characters damage at 999%. The only real difference is that you have unlimited jumps pretty much. As broken as he is, I believe Onslaught Falcon actually has amusement potential. Although I've never done anything with PSA (this said, you can just write me off as an idiot lurker), I think you should try some other experiments apart from changing the damage, jump count, physics, and knockback.

I usually use his charged B and Usmash moves as killing moves when I use Neku xD. And I just remembered something (was going to ask about it earlier but forgot), does Neku's Ftilt seem spammable to anyone else (or is it just me)? xD I can use it to edge-guard without getting in the opponent's attack range.
Something I think looks slightly odd is when Neku runs and grabs an opponent, he slides kinda far after grabbing, though I don't know if it is supposed to be like that or not.

xD Neku is awesome! The link isn't broken, mediafire just happens to be updating right now until like an hour from now (or something like that). I was playing around with him for about an hour and noticed a couple things.

Final Smash
His final smash doesn't seem to do the nice little "freeze time" effect.

It kills on contact regardless of percentage unless the distance is wide and with DIing (I'm guessing that is why it says "usually a OHKO" xD), at least I think the comp DIing (xD it can kill Ganondorf from 0% on the opposite side of Final Destination), which seems a bit overpowered when compared to a majority of the other final smashes.

If you use his final smash in the air, momentum is preserved while he is using his final smash (so he continues falling while using the final smash, whereas the opponent doesn't). Also, when using the aerial final smash, you can move left and right while he is using it (when the opponent is out of range, there is 6% dmg and no knockback).

And its kind of awkward seeing the beams of light not actually do any damage to the characters that you can't get in your initial range when using the final smash.

Down+B (Grounded)
I didn't realize it was a cursor for quite a while xD, but the cursor seems to have a very strange effect. When the cursor is on Metaknight, Metaknight gets caught in something like an infinite fall and just twitches in the air until the cursor is moved away. I think its only on light characters because it didn't do anything to Ganondorf and some other characters. The cursor also seems to cancel out almost any attack (like when two people press A at the same time and the moves get cancelled), which is pretty amusing.

Up+B
Works wonderfully except that you can't reverse the direction of his ascent. When you jump forward and try to use Up+B in reverse, it doesn't seem to work and he just uses the attack forward (or maybe I'm just that bad at using his recovery move xD, totally possible since I do fail at Marth's recovery a lot as well). It doesn't really serve as a problem until you use it to recover after chasing the opponent offstage.

Neutral B
xD This move rocks (Nexus Ray ftw), its too short to seem epic, but it is an awesome way to finish a battle. Aerial B by itself hangs in the air (I never tried mashing the B button) if you use it at the tip of the second jump. He hangs up there long enough that if you jumped all the way offstage with both jumps he can still hang in midair and land back on the stage.

Grave Marker
This move seems really quick. If you use it on someone, they pop upward just enough for you to short-hop and use Grave Marker repeatedly until they hit like 80% (and then you own them with nexus ray xD).

And then just something I find as a fairly good combo for those that want to screw around, aerial side+B to an aerial up+B is almost lagless, so it looks like a nice fluid move. Too bad it doesn't work on the ground xD (probably because if it was possible to do that on the ground, the lag after side-b would be a lot shorter, making it an extremely spammable move xD)

-typed most of this up earlier but didn't have the time to post it-

Just a crazy idea (totally support this Neku project btw) because TWEWY was uber unique, I ended up thinking of a fairly random, but partially unique idea (I think). What if down+B (grounded and charged) brought out one of Neku's partners like Shiki or Beat (I didn't like Joshua all that much xD) via down+B+A/X/Y that could sort of defend Neku by using the X,Y,A,B buttons to attack (small damage like 1-3% per attack), and the c+stick to maneuver (though they can vanish before Neku releases the lightning bolt if they get hit enough maybe), while the control stick is used to maneuver a cursor for the lightning strike while the overall attack can only last for a short time (1-2 seconds?). And then for uncharged could be an undefended lightning strike that does less damage (Neku didn't focus hard enough, too many distractions and no partner to rely on xD).
I'm thinking this idea is totally unrealistic, but that would make him be amazingly fun to use xD. It would be almost like pokemon trainer, but harder. I know absolutely nothing about attack hacking or anything else (the only reason I made an account here was to post a few ideas for a down+B attack because Neku is just that awesome xD)

On a more realistic approach, possibly down+B and then tap a direction to send a semi-ranged "bolt from the blue" to the direction tapped (with some lag time before so Neku can charge up some electricity) and even a charged down+B for an "evolved form" attack. (I'm looking at Thunder Rook and Lightning Rook xD)

Or possibly something like a charge effect where Neku gets charged with electricity, making him a mite faster and stronger with electrical damage until he discharges with another down+B (something similar to Lightning Moon/Lightning Storm maybe).

And as a sort of amusing idea (not really practical, more of just me trying to implement the most amazing pins ever xD), you could have the down+B control a series of charging, each taking longer than the last for five charges, and then you get invincibility for a short while (and no special moves, only A attacks) xD! I think its pretty obvious where this idea came from ("One Jump From Eden", "One Skip From Eden", "One Hop From Eden", "One Step From Eden", and "Eden's Door").

Sorry if these are really just way out there (just trying to get some ideas out). Noob is as noob does, and I am definitely a newb when it comes to this sort of stuff xD.