What are your thoughts on people making random characters albino (especially regardless of their race, even if they aren't black? Would it count as fetishizing under certain ways?
I've heard that albinism can appear in any race group, but I'd just like to know how you view just random characters casually having albinism (even without it being sexualized for fetishized)
Casual representation is great. Not just albinism, but disability in general. You don't always have to go into complicated details of "how's it like to be disabled". But just because it isn't meant to be a work about a certain condition doesn't mean you shouldn't do your diligent research—if by making random characters have albinism you mean giving them the "aesthetic" and nothing besides that, it would be fetishization or at least just poor representation.
Also, for this answer I'll be talking about oculocutaneous albinism because I'm fairly sure that's what you were referring to, but please be aware that there are other types, like;
ocular albinism (has 3 different subtypes),
Heřmanský–Pudlák syndrome,
Chédiak–Higashi syndrome,
Oculocutaneous albinism also has multiple (7) main subtypes, with some of them splitting further. You should take that into consideration as well when deciding on what kind of albinism your character(s) has. I'm not saying that you should write "X has oculocutaneous albinism, type OCA1b" in your book, but it will help to inform you what their needs and symptoms could be.
Another thing I will mention is that the word "albino" is generally not the preferred term, and you probably shouldn't use it unless you have albinism yourself. Here's a page on it by the National [USA] Organization for Albinism and Hypopigmentation or this post we reblogged recently.
To make sure that your representation works, you need to understand how albinism works. Even if it's a side or minor character, you should be aware of the symptoms other than just the lack of melanin. Prime example, the extreme majority of characters with albinism in media don't have any vision issues at all, which is not how it is in real life. If you make a character with albinism, you're making a character who is blind or low vision. It's important to research aids and assistive technology, as well as blindness tropes that your character could fall into. For a character that only shows up occasionally, it's still important to show things like a white cane, their light sensitivity, them having to avoid the sun.
If that's your approach to "making random characters be disabled" then you should be good. A lot of disabled characters end up boxed into specific tropes (for oculocutaneous albinism: being evil, being emotionless, having magic powers [in a setting where that's not the norm], or being mystified because of their disability) so having e.g. a background character with albinism who has a regular job and shows up in the story from time to time would mitigate that. People with albinism are normal people.
It's true that a person of any race or ethnicity can have albinism. Some types of albinism are more common in certain demographics; for example, Heřmanský–Pudlák syndrome appears much more frequently in Puerto Rico and OCA4 is almost exclusively seen in Japan, and oculocutaneous albinism is more common in sub-Saharan Africa as a whole (which is a giant area, but there's not much statistics about it). But your character could be of any background to have albinism in general.
In short, if the representation would end at "giving a character pale skin, white hair and red eyes*" then it's more fetishistic than representative; that's just using the appearance but ignoring everything else. Keep in mind that it's a medical condition, not an aesthetic. If a character stops having albinism when they dye their hair and wear colored contacts, then that's just a character who happened to have light hair skin and eyes, not a person with albinism. Good representation of disability means showing the disabling parts of it—again, you don't have to go into detail about how it is to have albinism if the character shows up for two chapters, but show them navigating with a white cane or at least wearing clothes that take into account sensitivity to sunlight.
*In real life, people with albinism don't have red eyes. I mention it because it shows up in media all the time. It just screams fetishization because it's not a thing—most people with albinism will have blue, gray, hazel, or brown (!) eyes.
I hope that this helps—if you have a more specific question, feel free to send another ask. I also recommend going through our #albinism representation tag, it might answer some of the questions you might have.