From intricate armor builds to whimsical mashups, Thy Geekdom Con delivered some truly unforgettable cosplay moments! Held at the Greater Philadelphia Expo Center in Oaks, PA, this year’s event featured an incredible array of creativity that was featured at the masquerade and hall costume contests.

We’ve rounded up our favorite looks from Vocaloid, League of Legends, Demon Slayer, and more this weekend. Read on to see which costumes caught our eye and stole the show.

Masquerade

Mizi and Sua from Alien Stage

Jessica Rabbit from Who Framed Roger Rabbit?

Crybaby from “K-12” by Melanie Martinez

Gawr Gura from Hololive

Black Parade Hatsune Miku mashup from Vocaloid / My Chemical Romance rocking out.

Minori Hanasato and Haruka Kiritar from Project Sekai / Hatsune Miku Colorful Stage by @colorful.tomorrow.

Kanan Matsuura from Love Live! Sunshine.

Nono Daichi from Aikatasu!

A classic take on Hatsune Miku from Vocaloid.

Kagamine Rin and Len, also from Vocaloid.

Muzan Kibutsuji from Demon Slayer by @miacosplay101.

Mutsumi Wakaba from BanG Dream: Ave Mujica – The Die is Cast by @peachy_pink_ash.

Wanderer from Genshin Impact

Chuuya Nakahara and Ryunosuke from Bungo Stray Dogs

Junko Enoshima from Danganronpa

Angel Dust from Hazbin Hotel by @satinerougeburlyq.

Kanade Yoisaki and Mafuyu from Project Sekai: Colorful Stage

Bubble, Pop, and Solisk, original characters from the DND realm.

Kotori Minami and Mozomi Tojo from Love Live!

Matsuri Tokugawa and Emily Stewart from The IDOLM@STER Million Live!

Sparkle from Honkai: Star Rail by @healingcatcos.

Dia Kurosawa and Hanamaru Kunik from Love Live!

The Great Witch Shelby from Empires season 2 by @sunny_daze_cosplay.

Sonic and Shadow from Sonic the Hedgehog by @rosesnowidols.

Akiyama Mizuki from Project SEKAI by @idoladora.

Elvira the Mistress of the Dark by @silvyr_shadow. We were fortunate to interview the real Elvira, which you can read on here.

Hanayo Koizumi from Love Live! School Idol Festival by @ominouspug.

Hall Costume Contest

Our judges for the hall costume craftsmanship contest were dressed for the occasion, including @kazistarcosplay as Mad Moxxi from Borderlands and @cosplay_hopeful as Izutsumi from Delicious in Dungeon.

Jynx from League of Legends. We previously posted an advanced tutorial on how to make your own Jynx costume.

Steampunk Alien from the Aliens franchise. Emphasis on steam, as this costume emitted smoke on command.

Caduceus Clay from Critical Role

Usopp from One Piece

Vi from League of Legends

Choso from Jujutsu Kaisen

Deku from My Hero Academia

Belle from Beauty and the Beast in her holiday red dress.

Dreadtrap from Five Nights at Freddy’s

Maomao from The Apothecary Diaries

A creative interpretation of Marinette, also from Five Nights at Freddy’s

Are you one of the features cosplayers and would like to get tagged? Did we miss anyone you know. Reach out to us and we’ll add a mention.

Also check out our coverage of cosplay at other recent cons, including Katsucon 2025, New York Comic Con 2024, and Retro Con 2024.