I make vector traces for fun, feel free to use any of them for your own edits and projects (Wallpapers, avatars, posters, itasha, etc) as long as it's for personal use. A download button is always available for high resolution.
Don't worry. You can make them when you have free time. My favorite characters are Rin Shibuya, Hifumi Takimoto, Megurine Luka, Maki Nishikino and Dia Kurosawa. Good luck at your free time.