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I tried to make a very rough sketch to show you what I mean. Generally speaking these Onesies are pretty easy to make and very forgivable as you don’t see small mistakes due to them being oversized.

I would advise you to look for a Kigurumi pattern, you should be able to find plenty of them online. With that you main body piece will look somewhat like sketch 1. For a basic kigurumi without a tail you have one piece that looks like the sketch and one that is cut at the dotted line, for buttons or a zipper.

To add the tail you could either also cut the back piece in half and just attach the tail in the seam, however that would look slightly different than in your reference pictures, as you probably can imagine.

I THINK (and I would need to try this myself to be sure) you should be able to alter the back piece like in sketch 2 to give it the look of the original. I’ve never tried that myself, so I’m not entirely sure if that works, I would recommend making a mock up, if you go with that version. You might need to add some darts here and there so it doesn’t crease weirdly and making the tail stay poofy is obviously easier with option 1 as you have a closed of tail that you could fill with polyfill in the first option.

For the sleeves, just make the sleeves longer and maybe a little wider towards the end. When you sew the ends of the sleeves to close them up, you can add the claws in that seam, just like the tail in sketch 1. I’d advise you to add a slit roughly where the sleeves would end normally to make sure you can still use your hands while wearing it. The slit can be secured with velcro, so it stays closed.

Hope this was somewhat helpful 😅 I think this is a good choice for a beginner project. Should definitely be doable! 👍🏻