Yeah, I didn't think you would get the lingo that's why I said I'd be your guy for it. ;p It could add an interesting bridge between the two communities and would be a decent source of comedy. But if you'd rather not touch that kind of stuff then fair enough.
If you'll looking for characters and VNs to parody then here is a list of things that comes to the top of my head:
Sci/Fi: Have the representative character be a parody of Okabe Rintaro (Hououin Kyouma) from Steins;Gate. If you're too lazy to watch the anime, here is a scene that basically sums up his character:
(scene)
Murder Mystery: You'll definitely want to parody Umineko. If you can, you should have both Battler and Erika (in fact, Battler could double as a Pheonix Wright reference since he kinda of shares some similarities with that character). But you should definietly parody the "intellectual rapist" Erika. Here's a good scene of her:
(scene)
Dating Sim: To Heart is a good choice, if you go with that I would specifically recommend parodying HMX-12 aka Multi. This character singlehandedly popularized robot school girls and robot maids (she's not actually a maid, but she likes cleaning). Here's a scene from the anime, she's the green haired one:
(scene)
Chuunige (aka, Edgelord shit): Eh, the standard choice to go with would be to parody Fate/Stay Night, or Tsukihime. But I'm really not a Type Moon fan. If you want to appeal to normies then go with this, but I won't help you with this choice since again, I really don't like Type Moon. If you want to show the kids on the block that you're cool though, you would parody Reinhard from Dies Irae. An immortal Nazi that harvests human lives for their spiritual essense inorder to ascend to Godhood (see, how could you get more edgy then that!?). Here's the best I could find, it's a speech of his. Don't worry it's subtitled:
(scene)
Btw, I get it, even if just for parody Nazis are bad PR. So if you parody him, I recommend making him an immortal Stalinist or Maoist instead. There, problem solved.
Moege (aka Lolicon bait): This should be obvious, a 500 year old vampire that looks like 7 year old. If you want to be extra playful, make the character a 500 year old shotacon (male version of a Loli), and have that character himself have an unhealthy interest in Lolis. In fact, if this reality show is taking place on an island, have the island be owned by him with random freaky sex dungeons found throughout (Epstein reference).
This is what comes off of the top of my head. Idk if this is what you had in mind, but you request was kind of vague. I might come up with more later.