In the Senate, Romney definately didn’t vote for Trump, and Murkowski and Collins prolly didn’t either. I bet someone else who has a good relationship with Biden secretly voted for him that we might not expect.
Not that many Republicans left who actually served with him in the Senate, though: Grassley, McConnell, Shelby, Inhofe, Collins, Crapo, Cornyn, Murkowski, Graham, Burr, Thune, Barrasso, Wicker, & Risch. That's only 25% of their conference, & even that's including Risch, who only "served" with Biden in the Senate for all of 12 days. Of the non-Collins/Murkowski options, maybe Lindsey Graham still secretly voted for Biden after everything? And/or
maybe Grassley or Cornyn? Other than them, though, it's really slim pickings.