Thanks for the question. Peter Higgs (https://en.wikipedia.org/wiki/Peter_Higgs) would be my choice. He was jointly awarded the Nobel Prize for Physics in 2013 for his work on subatomic particles which was validated in the CERN’s Hadron Collider. A very humble man.
Jocelyn Bell-Burnell would be my second choice (https://en.wikipedia.org/wiki/Jocelyn_Bell_Burnell). An amazing scientist, she’s an astrophysicist, and she was born down the road in Lurgan, Co Armagh. Very encouraging of students and again a very humble person, considering what she has achieved.