Cross Levelling

There's a strong temptation on superhero games to start helping other characters out with new gear and talent.

This is one of those issues that treads out of 'what's fun' and into 'what makes for a good story'. Yes, it would be awesome to give Cap's Shield and Thor's Hammer to Wonder Woman while she's wearing Vibranium armor and wielding the Infinity Gauntlet full of Lantern Rings.

This is really, really bad writing.

As much as I loved Infinity Wars, look at Parker getting the Iron Spider outfit. In two movies he went from 'sweat pants and goggles' to 'classic Spider' to 'Ultimates Marvel Alliance 2 Sweet Unlocked Special Armor With Max Stats'.

Try not to look at other characters as means for power-levelling, rapid advancement, or sweet rides and cherry gear. Look at other characters as /characters/, first and foremost.