Explain your theme [username, icon, and sig]. Part tres.

Theme: my recent obsession with Mass Effect and love for Thane.
Username: my online handle.
Avatar: FemShep watching messages from Thane after his funeral.
Signature: lyrics from Faunt's M4 Part II, and a story plug.

Everything:

pls laugh, i'm hilarious

Theme: Mix of Halloween and my obsession with Khloe Kardashian.
Username: Kardashians. Khloe is my favorite.
Avatar: Harley Quinn.
Sig: Without a Fight; Brad Paisley and Demi Lovato.

Theme: Jennifer Rostock, "Hengstin"
Username: Title of the above song
Icon: Jennifer Weist
Signature: Lyrics from the song, meaning, "a path begins when you first walk it."

Theme: I have no idea. Emo trash?
Username: Song originally by The Cure, covered by Alkaline Trio
Icon: Girl covered in fairy lights.
Signature: Lyrics from Transmission Home by Yellowcard

@ aliens.
Admittedly I laughed a lot harder than maybe I should have.

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Theme: Jotunheim/Winter.
Username: I think that's sort of self explanatory, it's the one I've had for....4 years now. Holy shit.
Icon: Loki with flowers and gold in his hair, snow in the background.
Signature: Simple and for the season.

Username: song by Melanie Martinez
Avatar: Frank Iero and Gerard Way from My Chemical Romance
Signature: Lyrics from Scars by Michael Malarkey

Theme: "Kirby" by Aesop Rock
Avatar: a screencap from the song's video
Signature: My favorite lyric from the song.
(username is unrelated and is always the same, and I've explained it before several times. lol)

username: "wonder years" by real estate
avatar: just some random picture i found on tumblr
signature: lyrics to "monsoons" by puscifer

theme: still emo trash, always emo trash
username: as always
avatar: space-looking girl, stolen from fae because I have no talent
signature: lyrics to 'another night on mars' by the maine.

theme: not quite sure!
username: pierce the veil song
avatar: fashion icon skeleton, taken from fae
signature: afterglow by all time low, but that's changing soon!

Theme: nothing in particular
Username: literally just the name of a Korean singer (how original I know)
Avatar: a picture of a k-idol who's angry and gay, just like me
Signature: a verse of a poem by Fernando Pessoa in its original language (portuguese) which reads "I am nothing. I will never be more than nothing. I cannot want to be more than nothing. But, besides that, I have in me all the dreams in the world." (It sounds better in portuguese ㅠㅠ)

Wow, I never posted in here about my current theme despite the fact that it's maybe my favorite one I've ever done!

Theme: The X-Files/ MSR (that's the ship name for Mulder and Scully, ancient fandom times did ship names differently. lol)
Avatar: Mulder and Scully, together, at the very end of the series.
Signature: Lyrics from the song "Say You Won't Let Go" by James Arthur because I have decided that song is an MSR song, and it gives me all the feels.
(username is always the same and is, as usual, irrelevant to the rest of the theme.)

Theme: A mess!
Username: After Yennefer of Vengerberg from the Witcher series, otherwise known as my wife
Avatar: Dia from Aqours: Sunshine! Dream card.
Signature: Florence and the Machine's 'Cosmic Love', an oldie but a goodie

theme: autumn ( ´ ▽ ` )
username: jinko., a nickname given to atsushi nakajima from bungou stray dogs, aka the softest and best protagonist
avatar: v cute fanart of america from hetalia in a pile of leaves
signature: lyrics from stay lost by joe hertz

theme: much spooky
username: me thinking i'm being spooky by changing the usual 'boy' into 'ghost'
avatar: spooky people stolen from fae as always
signature: lyrics to 'we only come out at night' by smashing pumpkins

theme: this is actually my halloween costume theme for mibba this year
username: natsuki subaru, the protagonist of re:zero
avatar: just some official light novel art
signature: it's a quote from the anime, it might also be in the light novels? but probably translated differently

theme: all around witch mercy
username: witch mercy, after the overwatch character's halloween skin
avatar: witch mercy
signature: the quote she says when she resurrects an ally

theme: atsushi-kun (´∀｀)
username: doppo., the given name of kunikida doppo from bungou stray dogs and the best boy to end all best boys
avatar: beautiful fanart of atsushi nakajima from bungou stray dogs by this artist
signature: a quote of dazai's that was directed at atsushi

theme: Asuka from Neon Genesis Evangelion
username: although she's not called red devil, she is often referred to as Monster Girl by one of the other characters due to her temper and her suit is and Eva (her giant robot thing) are red.
avatar: fan art of Asuka.
signature: lyrics taken from Breaking Benjamin's I Will Not Bow song. Since the song seems to match her overall personality and motivation in the anime.