Because someone asked very politely (instead of demanding), here’s Northstar’s file card from the recent Superheroes comic (with file cards “written” by former Captain America Steve Rogers):
Northstar

Yes! Make Northstar an Avenger!  I would love to see him teaching at Avengers Academy too!  What if Northstar and Aurora became the Heroic Age equivalent to Quicksilver and the Scarlet Witch?  The possibilities are staggering!