Is it okay to take a character from a scan you found on the site and use it in your wallpaper?

I just want to make sure that I don't do anything wrong and gets in troubles

hey there qtR

welcome to MT and enjoy your time here as much as possible ok? have alot of chibi as well, hehe

*shakes hands*

and sure, you can use scans to make your own wallpaper with... just watch the gallery, there's full of it, haha go ahead, help yourself