Here's a list of VTubers who either prefer foreskin/uncut cocks or are anti-circumcision:

Snuffy: Prefers uncut, seems to have a foreskin kink.

Nekrolina: Said she “prefers hoodies” when talking about cut/uncut preference. Made fun of circumcised penises.

Anny: Expressed preference for uncut and is anti-circumcision.

Lucy: Prefers uncut. Thinks uncut is based. Implied uncut is superior to circumcised. Implied negative view of circumcised penises and positive view of uncut penises. Is knowledgeable about foreskin.

Filian: Anti-circumcision. Jokingly called circumcision a "rip-off" (har-har). However, right after, she said "Like, why would you even do that?" Has shown a very clearly implied negative view of circumcision whenever the subject has come up.

Leolayla: Said in a thread on 4chan that she is anti-circumcision.

Cottontail: In her geoguesser stream where she had electrodes clamped to her "thighs", expressed her preference for uncut penises. Plus, "volunteer" in all her porn is an uncut guy.

Inis: Is Anti-circumcision. Thinks it's weird how common circumcision is. Understands the functions of the foreskin and the negative aspects of being circumcised.

Pippa: Is anti-circumcision. When asked if male circumcision should be illegal if female circumcision is, she said yes.

Moriko: Is anti-circumcision.

Nanobites (now Kibawoo): Prefers uncut, made fun of circumcised guys. Is anti-circumcision.

Kana: Prefers uncut and is anti-circumcision. Has ranted negatively about circumcision and thinks that infant circumcision is immoral.

Milky: Prefers uncut. Has a smegma fetish. Said so in hentai tag tier list ranking.

Lyra: Prefers uncut.

Kirsche: Anti-circumcision. Brings up foreskin A LOT. Has ranted many times about how she would never have her future sons circumcised.

Mozumi Pichi: Is Anti-circumcision. When collabing with Inami Yoki, she was asked "Why do people have foreskin? I’m actually mildly curious." To which Mozumi responded with "They should. It’s natural. If you are in chat and you’re gonna have a son, do not do the snip-snip. Make the right choice."

Chromu: Prefers uncut. Considers circumcision to be genital mutilation (which it is.)

Shiori: Prefers uncut and is anti-circumcision.

Ebiko: Prefers uncut.

LaynaLazar: Anti-circumcision.

Yumprincess: Prefers uncut. Said "I kinda have a crush on uncut pps".

Tomoe Carmine: Anti-circumcision.

SaveHymn (Meredith): Prefers uncut. Says she wants a dick that's "disgustingly huge and uncut".

Purin: Prefers uncut. Said she really likes foreskin a lot, then went on to mock circumcised guys.

Mako Fukasame: Anti-circumcision. Talked about how wierd circumcision is, and how circumcision isn't performed in Australia (where she's from).

Akemi Kurai: Said she prefers uncut on Twitter.

SquChan: Anti-Circumcision. Said she was against it when reacting to the ShoeOnHead USAID video.

Clara Kaminari: Anti-circumcision. Said in a collab with Rie and Erina that both female and male circumcision are fucked up and said "stop taking skin from people, ya weirdos."

Luto Araka: Anti-circumcision. Said circumcision shouldn't be performed on unconsenting children.

Leah Asimov: Anti-circumcision. In a collab with Alteri Limina, they both said that if either one of them had a son, they would never circumcise him, and that it's mutilation.

Walkyria Liora: Anti-Circumcision. Said in a collab with Leah Asimov that she, too, would never circumcise a child.

Scarlette_EN: Anti-circumcision. Said in the ShoeOnHead USAID video that if tax dollars are going towards circumcising babies, that you can go fuck yourself and your house should be pipebombed.

Chelzor the Destroyer: Anti-circumcision. Asked her chat how they feel about circumcision, then said it's 2025 and not all of us are Jewish.

Saruei: Anti-circumcison. Said she thinks it's horrible to circumcise children's penises.

Ellie_Minibot: Anti-circumcision. Explained in a collab with Shoomimi, Minikomew, and Chrchie why circumcision is bad, debunked a few pro-circ myths, and explained why having foreskin is better than being circumcised. Shoomimi, Minikomew, and Chrchie Were all in agreement.

Shoomimi: Anti-cirumcision. See above. Also expressed anti-circumcision sentiments, saying that it's sad that an unnecessary medical procedure is practiced on unconsenting babies who don't even need it.

Minikomew: Anti-circumcision. Was in agreement with Ellie and Shoomimi about their anti-circ sentiments.

Chrchie: Anti-circumcision. Was also in agreemant with Ellie and Shoomimi about their anti-circ sentiments.

Callie Calico: Anti-circumcision. When asked in a question and answer stream if she prefers cut or uncut, she said she likes "sweaters" and thinks they're cute and defended uncut men. She also said that she wouldn't circumcise a child and that they can decide for themselves when they're older if they want to.

SmugAlana: Anti-circumcision. Said she's against men getting circumcised against their will, that even though she's joked about it in the past, she thinks circumcision is bad, that she doesn't like circumcision, and that she thinks it's strange when parents circumcise their sons.

Feel free to add to the list.