I kept forgetting that we know nothing about Percival. Mum and I were trying to figure out why Ghost!Uther was so pissed with him, and then I remembered he just showed up with Lancelot all 'hey, I'm really tall' and was probably a commoner. I often wonder if Lancelot and Percival hung out, or if Percival was just nearby when Lancelot got the summons to help Camleot and he went 'you, tall person, come be bare armed and strong with me' and Percival was too polite to say no.