Can't find a sprite sheet for a certain video game? This is a tutorial I made for newbies on how to take your own sprite from an image. I'm not sure if this can be done on MSPaint, so if you don't have Gimp, download it for free by googling it.
First, select an image off the internet that has the sprite you want in it. Copy it, then start up Gimp and choose around 100x100 (l x w), depending on how big the sprite is. Before clicking okay, click on advanced options, and under "Fill With", select transparency. Now click okay, and paste your image onto the canvas. Make sure that you can see the sprite you want clearly.
I chose Mario as an example.
Next, click "View" on the top toolbar, then click on "Zoom", and select 800%. That's a decent zoom choice for pixel art. Scroll and/or use the move tool until you have a clear view of the sprite onscreen.
Now select Eraser off the Gimp toolpanel. On the bottom half, checkmark the box with "Hard Edge" next to it. Under brush, click on the box with a circle in it, and select the one at the top left that's a single pixel. Start erasing the background touching the sprite pixel by pixel, like so. There should be different shades of gray underneath when you erase it on Gimp.
There should be different shades of gray underneath when you erase it on Gimp. That signifies transparency.
Keep on erasing around the sprite until it looks somewhat like this:
Now, select a larger eraser tool and start to work on erasing more of the background around the sprite, WITHOUT erasing a single pixel of the sprite itself.
Once that's done, zoom back out, then select an even larger size for the eraser and erase away the rest of the background. And
Voila! You have a sprite.
Now save it as either a regular Gimp format or gif. Don't save it with a format that can't handle transparency. Gimp should alert you if the format you selected can't.
To use your sprite in a comic, just go to "Edit" at the top, then select "Copy Visible", then open up your Sprite comic and paste it in!