One of the things that might be difficult for folks who want to create their own characters is tying them to the Marvel universe.
Here are a few character Milestones that try to do just that by attaching Milestones (Milestoning?) to iconic Marvel motivations.
“Welcome to the X-Men, hope you survive the experience.”
1 – For asking if you are now a member of the X-men.
3 – For taking stress in an Action Scene alongside an X-man.
10 – For either being inducted as a full fledged member of an X-team or walking away from X-folk forever.
Once a criminal, now an Avenger
1 – When you verbally defend your right to be among the world’s best super-heroes.
3 – When you give Emotional stress to a hero who doubts you.
10 – When you prove yourself by during an Trauma in an Event or leaving the Avengers (for a while).
Humans are puzzling.
1 – When you misunderstand something basic about humanity that is funny or odd.
3 – When you cause someone stress because of your inhuman ways.
10 – When you make a big step towards integrating into human life or go the other way and become even more alien and incomprehensible.
DIE MUTIE SCUM!
1 – When you admit that mutants make you nervous.
3 – When you tell a mutant that they should surrender some of their rights in order to make those around them more comfortable.
10 – When you either get over your bigotry or become a die-hard anti-mutant advocate.
Former Herald of Galactus
1 – When you recount a detail of a world you helped Galactus consume.
3 – When you take stress defending your adopted home against a cosmic threat.
5 – When you either repent and realize the wrongs you have done or go back to Galactus and serve His infinite hunger once more.
The Punisher is right.
1 – When you announce that a villain deserves to die by your hand.
3 – When you arm a friend with a lethal weapon.
10 – When you either kill a villain in cold blood or realize the error of your ways and allow them to live (even if that is in jail).
NOTE: Chris has some great examples of mutant milestones in the comments, worth taking a look.