In this way, I encountered David Gwillim in the BBC Henry IV and Henry V. When I went to college, I would visit the AV area and watch Henry IV, Parts I and II over and over again.
I consider Tom Hiddleston's Prince Hal (from Hollow Crown) to be quite impressive (even if one is reminded that dark-haired Hiddleston is quite tall and lanky; he just doesn't look that way when not acting next to Chris Hemsworth).
I consider Branagh's Henry V to be a tour de force--and the love scene between Branagh's Henry and Thompson's Katherine showcases the skill and comic abilities of both actors.
However, I had a HUGE crush on David Gwillim as a teen. Major major crush that was really only replaced, eventually, by Sean Pertwee in the Brother Cadfael mysteries.Luckily, for my self-perception, David Gwillim is a good actor. He shows up in Jeremy Brett's Sherlock Holmes as Percy Phelps (with a mustache!).
However, in fairness, I think looking back that my crush was less, ah, reasonable than an objective assessment of Gwillim's abilities. I think it was partly because I considered Gwillim hot but also because his character undergoes a transformation.
I find double identities and transformations inherently charismatic. In one scene at the end of Henry IV, Part II, Gwillim the newly crowned Henry V, no longer the rapscallion Prince Hal, walks through a crowd. He wears a kind of astonished smile.
It is utterly charming. (And, yup, I watched the scene a dozen times.)