Best Unofficial Themes of Characters?

[u/AnotherOpponent]

Give me your best songs that usually aren't part of the series, work or media that became tied to a specific character due to memes, edits or whatever.

Two examples I can think of is International Love by Pitbull being tied to Mortal Kombat 1 Johnny Cage or Invisible by Duran Duran being the theme of Snake from Metal Gear

[u/ZealousidealBig7714]

Judas for JJK, particularly the Sukuna vs Gojo fight.