Originator

Zero is the progenitor of the Maverick Virus and gives it to Sigma who reincarnates himself while also infecting others, Zero is also a robot who wears White and Red and has Blonde Hair while X the main protagonist primarily wears Blue.

Blue Moon is a song in the game and the game starts on a shot of the moon.
You also can die and also kill things with one strike, and you can wield knives.

You have intercourse with women

Ken is Blonde and wears Red.

You have sexual intercourse with women

Gwyndolin is literally Arcueid.

You slice people to instantly kill them.

There's a vampire and you kill a being called Chaos

Kingdom Hearts is just a big moon in the sky.

Consumption of hallucinogens

DIO is a vampire who has blonde hair, and wears red, there's also night time stages.

Protagonist has black hair and wears glasses, he also uses a knife.

It has the moon in it.

Moon is in the fucking title.

Pac-Man starts the game shaped like a moon, and can die, which is just like Tsukihime.

There's powers higher than mankind.

Also it's a visual novel.

There are night missions.

Sexual Content

There are undead creatures.

Zombies

There is a stage that starts you on the moon.

You kill things.

Vampires

You are a vampire

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Vergil wears blue and cuts things, Dante has shoulder length hair and wears red, also the moon is on the cover.

It's a visual novel

Sexual Content

Horror Vibes and Cute Girls, also death.

The protagonist gets possessed by an evil entity that reincarnates.

One of the guest characters is from Melty Blood.

They both have music.

Boo's Mansion/Tohno Mansion

Also Mario can die.

Both have underaged characters engaging in dangerous activity.

Joker is Shiki for beta males.

Sonic is blue and can kill things in one hit, Knuckles is Red and from an ancient tribe. Sonic is Shiki, Knuckles is Arcueid, I am drunk.

Both games have blood in them.

Kohaku is like the funny devil man Hazama. Here's artwork by ILoveKohaku97 which shows her dressed as Hazama it's based.

There's a lot of bad endings, also both games are visual novels.

These are both technically indie projects, the sole difference being that Yandere Simulator is irredeemably shit.

Time Vampires.

My friend is extremely mixed on both of these but I'm just gonna say it's because you play a guy who cuts people and is descended from killers or some shit.

Misogyny

You can program Melty Blood characters into the game.

There's a DLC with Vampires, and you can recreate the cast of Tsukihime in it if you wanted to.

Japan

Weird shit happens

The narrator's of both are insane

Both have music

Both have music

Some levels take place at night.

Moon is in the title of both

Weeb shit that defined a generation

Scary

Project Moon, Type Moon, they have Moons and are also visual novel makers.