Yes, we create characters here. Here is the manuel of style and use the Form:Character to create the infobox. For images, you can use images of other series, such as Ichigo from Bleach or Natsu from Fairy Tail, or you can use someone's character images from, say, deviantart, granted you should ask for permission. And emoticons... not really sure.
Oh, you mean the image that appears next to the words in infoboxes, like the Leaf symbol next to Konohagakure, or the Sharingan image next to the Sharingan? Those are SVG files. To upload those you need to save them in their SVG format and upload them as, for a few examples, File:Rinnegan.svg or File:Konohagakure Symbol.svg.