Talk:Tracer VS Scout/@comment-26902116-20160828060806

Question: When it comes to a series' creation do we go be the release date or the day the first piece of media is released (Such as a trailer or promotional image.)

e.g.: Tracer's first appearance in any form of media was the announcement trailer for Overwatch (I assume) in November of 2013 but the game didn't release until May of this year. So do we credit Tracer creation being in the May of 2016, the November of 2013 or do we go back further to the conceptualization of the character?