For Ehrgeiz, I think that's where his jab combo is based from:
https://youtu.be/p4EPJPENSlI?t=44. So, in Ehrgeiz, he does a side kick, turnaround back kick to the body, and another turnaround back kick to the head while in Smash 4, he does a side kick, roundhouse, and uses the momentum to swing to his right. Also, it looks like his Dtilt comes from Ehrgeiz as well:
https://youtu.be/p4EPJPENSlI?t=61, except it's kind of higher up and not low like in Smash 4, Tekken, or Soul Calibur where you can do a running slide kick.
And I think I found where his dash is from: Kingdom Hearts; people were able to mod Kingdom Hearts and this is footage of Cloud (and Xaldin) as playable characters in Kingdom Hearts II:
https://www.youtube.com/watch?v=-fWtzoAnNV0. Apparently, Cloud never runs in-game, but I don't remember ever seeing that since he spammed Sonic Blade all the damn time and at low health, he'd start spamming that and fly. Cloud can move around by strafing in Kingdom Hearts, but it's really, really slow. This is kind of bad... We don't know what his walk even looks like, but if it's based on Kingdom Hearts, then Cloud might have some issues when his only mobile option is running. When I'm talking about slow, I'm talking about Ganondorf walk speed slow. Cloud's strafe in Kingdom Hearts was really, really slow, but didn't matter 'cause Sonic Blade spam. Now, if his "walk" is based on Dissidia('s run), then he'd probably be at least Mario's speed since it's a jog with a heavy sword or at most, Little Mac's speed which would be insane as he'd have the fastest walk for a two-handed swordsman which is currently held by Shulk followed by Ike.
That said, Cloud has another thing under his belt: Cloud's based on multiple games some of which aren't even spin-offs to his own series; Cloud's based on the Compilation of Final Fantasy VII (of course) which includes FFVII, Advent Children, Crisis Core, and maybe Dirge of Cerberus, Dissidia Final Fantasy, a fighting game celebrating Final Fantasy and starring the protagonists and antagonists of Final Fantasy, Kingdom Hearts, a Square Enix and Disney collaboration, and Ergheiz, a fighting game that featured Cloud and other FFVII characters. Of the current third-party characters in Smash, Mega Man, Pac-Man, Ryu, Snake, and Sonic, all of them are based on one series or even one game like how Snake is Solid Snake, but has elements of Naked Snake from Metal Gear Solid 3: Snake Eater or how Ryu's mostly based on Street Fighter II. Pretty cool thing to have under his belt as not many... er... I don't think any characters have this distinction.