Obi-Wan is a fan favourite and with a lot of confusion currently surrounding whether or not he is getting a Solo-esque standalone feature, and what form said feature will take, Fallen Order could be an opportunity to whet the appetites of Star Wars fans across the globe.
Kenobi would be the perfect character to give our Padawan some much-needed training, so his role could perhaps take the form of a tutorial, or teaching both the player and character new Force abilities.
The options are endless, but we all know a little bit of fan service goes a long way in the Star Wars universe, and Obi-Wan is a character that fans of every generation know and love, and so would be the perfect friendly face to usher in a new era of Star Wars games.
I don't really care what form his appearance takes, as long as it starts with an iconic "Hello there", and EA preferably hires Ewan McGregor (or James Arnold Taylor - as was the case with Battlefront II) as a voice actor.