I seem to be late to the party but I am loving this character “Gwenpool”. First appearance on a variant cover to Deadpool’s Secret Wars #2, it was apparently just a part of a number of variant covers to celebrate the success of Spider Gwen (which I have been meaning to catch up on) but has grown into a character of her own. Premiering in “Howard the Duck” Vol 4 #1 she is becoming her own character (not a Gwen Stacy variant) and is joining the Marvel Universe!
Here’s a link to the covers in which she was created for:
And a link to more information from comic vine: