And those matchups are...?
I'll make it short and with only four of my examples.
is my most prominent (and secondmost dangerous) example. He has attacks that not only send Cloud off stage, but has so many more options to counter Cloud's own options, especially when it comes to getup and recovery. Link is susceptible to Cloud's combo ability and fast attacks, but can counter some of Cloud's attacks with his own fast attacks, if he dares block. A free Spin Attack awaits a blocked Cloud attack normally. Oh, and D-Smash dealing more KB on the semi-spike second hit makes him even more dangerous.
While not Low Tier, he will give Cloud a near-impossible challenge, since he can pretty much force Cloud to approach, and almost guarantees hits against Cloud that would otherwise not hit better characters. Gyro is also a pretty annoying projectile to deal with and Robo Beam makes Cloud kind of want to cry. And let's not forget that ROB has the throw combo ability and great edge-guarding, so good that Cloud's guaranteed dead recovering anywhere. F-Smash or D-Air, pick your death.
just became a bad MU for Cloud. Now that her N-Air deals 10% damage and more KB as a result, as well as her better combo ability against Cloud this patch, one N-Air at just the right damage will set her up to kill Cloud. Let's also consider her better frame data on various attacks, better combo ability (and damage racking), and her big ability to gimp Cloud (knowing what Izaw showed us, Cloud's doomed by Charge Shot).
He does have an even at worst, but 55:45 at best against Cloud. The buffs, like Samus, made him far better against Cloud than ever before. Just one F-Tilt will absolutely destroy Cloud at the right damage and read (which means Cloud will have to make the worst judgement), and yet even then, Ganondorf can still combo Cloud thanks to the buffs this patch, and deals a lot of damage no less. Considering Cloud is one of the few sword characters WITHOUT a counter, Ganondorf really has nothing more to fear from Cloud than he has to fear from Link or Swordfighter...except he doesn't have to fear Cloud at all. Cloud has only one projectile, decent range and good frame data (most of the time), but Ganondorf can just truck in and ruin Cloud's plans. One hit will lead into a combo worth 60% damage now.
I am not 100% certain on Ganondorf yet. I'm going to lab him against others when I get home so I can get a better feel for him.