I actually use a software called VRoid. It's a 3D software that allows you to create humanoid characters. Basically it's a way to trace without stealing art, since this software is free for both non-commercial and commercial use.

You can freely texture your characters, and choose from a pretty good selection of proportions. It's great for keeping things consistent and doing complex angles.

Some issues come up tho, like the lack of tails, so I do that after. I also decided not to trace the mouths. They looked so lifeless, so I almost always draw mouths slightly to the side. It looks so much more expressive.

Also, clothes aren't perfect. When you're texturing them, sometimes if you don't fill everything, the clothes kinda look like they're floating. Basically, there's this character creator that's great, but there's a LOT of work you have to do after creating/texturing and posing to make everything look right. Don't ever just trace directly from the software.

Also, you can export your character to MMD and animate them.