Tomorrow I'll start a new UX designer job, and the designer before me there made personas, but its are just prototypes. She said me that I should verify if its are well done. They didn't create this personas after user researches but in a workshop with product owners and the designer.
I don't want to restart the process with new personas because it could be very confusing for the team. But I think creating personas between PO and designer only, without researches and without any developer or marketing team member point of view is a risk.
It' s a risk because this personas are made from assumptions only, so it's not 100% reliable. It's also a risk because if developers and marketing didn't participate to the personas creation it will be harder to make them feeling empathy for the users.
So I'd like to know how you would do to verify if this personas are well done and how I could make ALL the team feeling empathy for them.