Simon is the first person that came to my mind when I saw this post. Also the way you said UK Inbetweeners made me realize there's also US version. Even the thought of it sounds terrible and I won't even bother to check it.

I'm bad at faces, but he reminds me of a combination of Mike Birbiglia, Seann William Scott, and Anders Holm. (I had to look up two of those names.)

Too long on the sides

It seems a bit much to me, as well as a bit dated, but not unusual, interesting, or offensive enough that I would look twice if I saw it in person. I agree, it's not atrocious.

The other commenter in this thread theoretically answered your question. I'm not familiar with the character, so while they're probably correct, I can't make any observations on it. I only know him as the "You guys are getting X?" meme guy.

I think your original question suggests you are familiar with the meme, but just in case I misinterpreted, here's a random example.

Will Poulter in the movie "We're the Millers".

Just look up "eyebrow actor", lol