nominally millwall as theirs are the only games i've ever been to, though good shout out with headie one given tottenham's the family team on my mum's side.
unfortunately growing up with an esoterically-inclined middle class dad means i'm not a real man, so the extent of my football fandom is liking david beckham when i was seven, liking the world cup and watching messi compilations on youtube.
millwall are the coolest team though. "noone likes us, we don't care", violence, the edl.
It's been like it since I was a kid though which predates Ian Wright and Henry. It's probably due to a quirk of London's geography I don't quite understand, some archaic piece of docker/ironworks history. WHU seem to pretty much die off at the Bow Flyover. Though going East their constituency extends right out into Essex.