How to get high quality 2d graphics from vector art to PS to Unity?

I'm currently developing my first game and I chose to make vector graphics in Inkscape, then move them to Photoshop to export and rig in Unity. The problem I'm having is that they always come out pixilated or blurry within the Unity game view.

Details about how I've set it up: my camera is orthographic and size 5, the aspect ratio is 16:9, the scale in the game view is 1x. My character imports are: 2048 max texture size, no compression. I have tried using mip maps but they just change it from pixilated to blurry.

How I make the art: I make it in Inkscape, open the file in Adobe Illustrator so I can copy and paste it into Photoshop, then save as a Large Document Format. I've experimented using different sizes. Since I based my background on the size of 1920 x 1080, I knew I wanted my characters to be around 300 x 300. If I make my character that size, then in Photoshop when it's rasterized it's bad quality already. However, if I make my character 1000 x 1000, when I scale it down in Unity, it becomes either pixilated or blurry.

Sorry that was long but I've tried a lot of different things and I'm at a loss, so help would really be appreciated!