That's not advisable. You could seriously injure yourself doing this and I recommend you stay away. Besides, sharks are hard to find and you probably couldn't get close enough to one before it swims away. Again, don't do it.
Dish soap kills bugs by melting the waxy coating on their exoskeletons. This means all bugs with exoskeletons will die if you use dish soap, not just chinch bugs.
Coloring them with a Sharpie pen won't hurt their functionality on the game portal, so they should still work with the games just fine. As for cleaning off Sharpie, try...