Soul's headband has a rectangular sticker with the word 'soul' and a circular sticker with a mouth and the letters E-A-T on it. This references his name, 'Soul Eater.' His headband looks a little different in the very first chapters of the manga.
His last name pays tribute to the famous American jazz pianist Bill Evans.
In Chapter 69, it appers that the round sticker with the 'E-A-T' letters that was on Soul's sweatband is now stuck to his locker.
In the official popularity poll taken by the manga's readers, Soul ranked 4th.
Part of his design may have come from Emine in Ohkubo's previous manga, B. Ichi. Both characters have white hair and red eyes and wear shoes with teeth marks on their soles.
Soul's theme song is, 'So Scandalous.' He also has a character song with Maka: 'Mauve Iro no Sympathy.'