sympathy references

Please Teach Me, Ika-Sensei!:
-The town of Manzoku's original appearance was here, sort of codifying its core traits of being really weird, but also in such a way that sort of defies outside influence.
-A Mr. Ooe, full name Hidenaga Ooe, was one of the PCs in Ika-Sensei, and is mentioned here.

Operation VK:
-Nanako is the protagonist of Operation VK. She is, in fact, the Ultimate Woodworker.
-Kojiro, her little brother teddy bear, is, in a more autonomous form, its deuteragonist.
-Dr. Rin Hashizawa is one of the primary antagonists of Operation VK. Her whole escape room thing is a reference to how she is, literally, a Zero. Long story.
-Megumi Kirisame, and her husband, Gavin Kirisame (nee Sakaki), are major characters in Operation VK. Megumi essentially serves as the 'rival character', and is the focal character of what I still think stands up as one of the strongest arcs in the fic and something I'm still proud of.
-Dr. Ijuuin Morinaga, the surgeon who helps fix up Kirimaru in Manzoku and who Pavel studies under, is a character in Operation VK—his 'paranormal vlogger' daughter Wanda is one of the core cast.
-Yayoi and Miki Murasaki, the Murasaki sisters, also live in Manzoku still. Miki, who is 12, is one of the three main characters of "A Story of Three Young People", the first appearance of the modern Manzoku, along with Shizuka Shirayuki (whose family is also mentioned) and Haruna Kudo (Nanako's younger sister.)
-The Inoue yakuza family originates here, though Satoko, in particular, is... different. For one thing, she's a teenager, not a forty-something with twin daughters (one of whom is a main character in VK, Chihaya Inoue.)
-Chelsea Toranosuke's surname, Toranosuke, refers to Claus Toranosuke, one of the core cast of VK. The two are actually half-siblings biologically, having both been children of the same American billionaire, Richard Darrow.

Wanderlust of the Golden Witch:
-Mitsuru Sumadera, who appears in Youka's Reminiscence, is the deuteragonist of Wanderlust. The family situation of the Sumadera family, along with a mention of its strange hair color, is essentially tying that in. He makes reference to his twin sister, but obliquely.

Rainflower Game:
-Jong-ki Park, who appears in Youka's Reminiscence, is one of the main characters of Rainflower Game.
-Minato Kuromatsu, in Sumie's Reminiscence, and his mentioned boyfriend Wataru, are also main characters in Rainflower Game.
-Councilman Ryuji Kozakura is one of the characters with the best claim to 'main antagonist of Rainflower Game', here appearing as not-yet-a-Prime-Minister as opposed to former Prime Minister. His familial link to the Inoues also originates here.
-Kyosuke Ayana, who appears in The Year Between, is a major character in Rainflower Game, and his currently-deceased sister Nagisa Ayana is, as well—the VR system used here is in fact the same system used for the plot of Rainflower Game.
-In Update 103, a "Miyake" is mentioned as being "the justice minister's husband". This is Eikichi Miyake, who in Rainflower Game is the current Prime Minister, and his wife is Shizuku Orihara, who is a major character.
-Remind me to explain what Naomi has to do with Rainflower after Update 103, it's a bit of a long story.

Vespa.EXE:
-Literally Vespa.EXE appears. Duh.
-Heinrich Scuttler, Richter's friend, is one of the main antagonists of Vespa.EXE, though in a very different context. Not doing hot over there.
-Oberstleutnant Blaster, Richter's CO in the military, is one of the brothers of a character named Wilhelm Blaster VII, a member of the Einherjar.
-Eiji also appears in Sumie's Reminiscence, obviously. Scoops and Detective Himekago get mentions.