Do at powerpoint! Already did many comics (not mariowiki) on powerpoint! There are speech bubbles and etc.! Every thing that you need!
Also if you have 1 mac try using Comiclife(or something like that). A program to create comics. I have it.
It's pretty good for the first time DB! :D
I could do less good one when I got photoshop
and only in the 10000000th time I could do one like that!
But you can still add the Nintendo logo AND the official nintendo seal.
If you added a "DS" in the bottom of "Super Mario Galaxy" also...