Screen burn-in isn't a problem on modern monitors, but it's something I worry about anyway. It's a holdover from ancient times.

I'm re-reading Hunter x Hunter and it always impresses me with how inventive and clever it is with the setting and all the different magic systems. Introducing an island where the characters can acquire supernatural effects with collectible cards (and possibly be harmed by an enemy's cards) was another bit of brilliance. Absolute top-tier shounen action series.