So as you know these are mine but off the top of my head?
My natives are Clay, Jace and Seth. The one who is most likely to know him on any sort of fundamental level would be Jace as he's only a few years younger though I don't know if it would necessarily be a good view he has of Ezra, depends on how they would have interacted esp as Jace makes no secrets about his own sexuality.
Then there's Dimitri (who has been around in MC for 60+ years), Sol who runs Heads + Tails (definitely a delivery option for sure) and Eugene who works in the hospital where I also imagine deliveries would arrive at!
The others around the same age are Jordan, Kai and Rowan so more than happy to talk how they could connect.