I suppose for fun I'll attempt to explain the origin of several of my usernames. May have posted about some old ones a long time ago in here idk.
I Got No iPhone (current) and Slushy the Slushball: Songs by Parry Gripp, one of my favorite musical artists. I also once had It's Raining Tacos, another of his songs, in my custom title.
Air Conditioner and Wittgenstein: Characters from Brave Little Toaster, a hugely nostalgic series for me. The sarcastic Air Conditioner is from the original movie, while Wittgenstein the supercomputer is from the sequels, which were generally not well-received but guilty pleasures of mine. Coincidentally both of them blow out and get repaired later.
Various long names I've had in July: I remember someone had a long name in 2013 and I found it amusing so I decided to shamelessly copy the idea (typical of me in 2013, the new user trying to fit in). Mine have been generally cringe though, I'll probably drop that 'tradition' this July (I only continued it because both of the times I had done it before happened to be in July)
greatdimentio: Obviously based on Dimentio, but also comes from my GameFAQs username, which was made with my favorite Paper Mario character, originally for the sole purpose of whining about Sticker Star (how original).
The Once-ler: From the Dr. Seuss classic The Lorax. I chose the original version exclusively because the new one was almost a completely different character (I still like him though). The original animated short was another thing I enjoyed as a kid, so another nostalgic theme. Everybody needs a Thneed!
King Antasma: A recurring theme of mine has been this one. The first time I used it was actually before Dream Team came out, and barely anything was known about Antasma. It was actually possible that "King" wouldn't end up fitting but sure enough, he's a bat king.
Stanley the Troll: Another from a guilty pleasure. This character comes from one of the most panned animated movies ever, A Troll in Central Park. Regardless, I actually like Stanley, he and his songs are pure and managed to hook me in when I was younger. Thus, another guilty pleasure (I actually have a huge track record of liking movies that are considered bad or subpar lol)
And finally the last one I'll mention now Lord Spongeful: just a combination of Fawful and SpongeBob, two characters with absolutely no relation whatsoever other than I like them both. So I created that hideous combination of them. It will stay in the past (other than in my rotating avatar for when I'm not theming) because it's just bad-fanfiction fodder.