I can second Damien Lewis’s niceness. I was once a very small unimportant cog in a day where he and Helen McCrory were the VIPs, and he went out of his way to thank me for the part I’d played. It would have been easier for him not to, so he’s high in my estimation ever since.
There are lots already listed who I’d be gutted about - Sue Perkins, Bob Mortimer, Olivia Colman, Rafa Nadal spring to mind - but I’ll also add Stephen Mangan and Alexander Armstrong. I know the latter’s BIL is reputedly a bit of a dick, but I hope AA is a good egg.
The Supervet is an arrogant arse who sometimes seems to put the welfare/quality of life of the pets he’s treating second to the potential professional kudos of achieving some new ground-breaking treatment. I know two different people whose animals were referred to him and both independently came away with that impression of him.