@Asira
I do my Body-Swaps completely in Unity, though it is more optimized to do it in Blender. This is the tutorial I used, it might seem kind of daunting but it's actually super duper simple. >> TUTORIAL VIDEO

I don't know if the tutorial includes this, but my tip is to make sure that you anchor everything to the same part so that the shading is consistent. If you don't know what that means:
Click an object, and look at the display on the right and towards the bottom above where the materials are listed there will be something called "Anchor Override". Some models have a specific thing in there armature they use as the anchor, but not usually. If it doesn't have a specific anchor I would use the chest. Simply open your armature and grab and drag the "Chest" part of your armature into the box. You can also just use whatever the body part of your model is already using. I would to this for everything on your model, clothes, accessories, etc.

You'll also need to edit the textures to match the skin tone like I mentioned above. You should make sure that both the materials are using the exact same "Shading" settings so that it is as seamless as possible. You don't need to be too precise since the hair will obscure the head and neck so if the colors don't match it isn't the end of the world, but it is nice to get the colors as close as possible.

#1 : https://linkmix.co/18727407 (Fullset)

#2 : https://workupload.com/file/RpH62rUgxW6 (Fullset)

Here's some more~

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~ Sorry if any of these are dupes!

Hello hello~
I was wondering if anyone had any of these things to share?
Thank you so much for reading even if you cannot assist

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1. Romance China - [Not Found]
Need for: Moe

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2. 【6アバター対応】ビクビク動くタトゥー - [Not Found]
Need for: Moe

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3.【5アバター対応】 Ripping Stockings 【VRChat想定】- [Not Found]
Need for: Moe

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4. Original 3D costume “Magus Bunny” - [Not Found]
Need for: Moe

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5. [ Cross Necklace / 十字架の首飾り ] - [Not Found]

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6. 【VRChat用】キキョウ花飾り - [Not Found]

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Here you go~
https://drive.google.com/file/d/1xUDDZwT7TfAbK-aoLyw5xeTxRlXQrxL3/view

https://workupload.com/file/PgeqCpxNs3F
Download for Manuka ^^^

Hello hello~

A lovely new outfit was just released, and I was hoping someone here already decided to buy it...

... I would love to use parts of this so if anyone has this outfit for Selestia and is willing to share I would be super grateful!

Thank you so much and have a lovely day~

Hello~ Your issue is likely that you changed your Unity layout. In the top right corner where it says "Layout" if you select "Default" it should go back to normal

The video is only available if you have purchased the item. You will find it in your purchases library.

THANK YOU I WAS LOOKING FOR SOMETHING IN THIS SO BAD !!

@BunniesLiesHere

You are wonderful, thank you so much

~ bump!

@noir
Thank you ! I'll give it a shot

Do you perhaps have the Angel Worker as well or know of someone who does?^
Thank you so much for this! I love this model!

BUMP

@lovemail

I have a feeling that the issue may just unfortunately have something to do with the fact that I am trying to animate something with physbones and i honestly don't know how to rectify that. I'll try asking around to people in VRchat itself and see if anyone can give me any other reasons why it may not be working, but I appreciate you very much for taking the time to help me

These are just a recolor of one of her expressions that exists by default, if you adjust the blendshapes you can set these as her default eyes and just recolor them.

The option looks like this and its located under eyes.

If you don't know how to use blendshapes:
Click on the avatars head
Look on the right side and find the option labeled "Blendshapes"
Drop down the menu
Scroll until you find the option I put and slide the option to 100

Following what was said above, something that really expanded making edits for me was swapping heads and bodies of different models. I am currently using Manuka's head on Moe's body as my main model, as I really like the look of Manuka's face but don't really enjoy how young she looks in regards to her body. By shrinking her head even further and adding it to the body of Moe, you can make the model look much less like a child/teenager which is what I see is often an issue for most people. People who post models on Twitter tend to do this to the extreme to exaggerate features.
The thing about Velle in particular that I've heard is that MisterPink (the creator) directly ripped off Kikyo's body when making it, so using Kikyo wouldn't be too dissimilar to Velle, though I know that Velle has more physics by default which is pretty nice there are way less assets for her and that is unfortunate. You also could very easily add Velle's head onto Kikyo's body if you like the look of her head in particular so that you could use all the Kikyo outfits. The only annoying part with this is that you would have to edit the body textures to match their skin tone, but this isn't super difficult using their PSDs if they are layered conveniently.

BUMP

#5 can be found here:
https://forum.ripper.store/topic/12908/bought-the-mamehinata-sheep-set
https://mega.nz/file/4X0yHZjR#4rEhHj7HBOa_vNfLSb1uQTj50SuR0yBlEdN2EFk37CM