Haato never had any australian friends in Australia. Used to be a massive westaboo but people laughed at her for being japanese and having a weird accent so she literally only hanged with other japanese people, she's said this much on stream.
Now shes a hardcore weeaboo that pretends to be a 2ch oldfag even though she never ever used any japanese social media because of her chronic westabooitis. She spends or used to spend hours everyday reading moepedia and filtering niconico videos by old to pretend she was there. The way she got excited when she understood Marine's lets go onmouji entry-level "reference" 'proves' she really did study japanese memes.
This is probably the first time in history this has ever happened.
Pekora, Aqua and A-chan are/were varying degrees of either RW nationalist or RW pan-asian ethnat. Aqua specifically half believes that an old school classical chinese pan-asian commonwealth is the way to go for Asia in 2020 if they wnat to compete, and goes out of her way to buy CJK-only products. This one may sound weird to you because you're sheltered in western talking points, but its not an uncommon belief in asia at all, its close to the default political opinion (as opposed to japanese or korean isolationism which is more fringe).
Pekora and A-chan at least were /v/pol/-tier internet nationalists. How much of their shitposting was actually their honest opinion and how much were meme exaggerations is up to you, but the actual irl non-rrat truth is that Pekora never studied English in school because she only likes Japan and Japanese, and that A-chan was ranked on the Japan top 200 in HS Japanese at some point and says "Kakugo" instead of "Nihongo".
This makes these three the most based in hololive.
Marine is not a virgin but she has Z tier fetishes even by western standards and she's extremely open about some weird ones on stream (genuine ryona, diaper fetishism, sleep rape) so the ones that she only says in private are probably way worse. This coupled with the fact that she's 17 (round 2, +2) years old probably doesnt help her dating in japan. Also most of her friends are either comiket gross otaku or comiket gross fujoshi so her social circle sucks for dating.
She's is also very brash and loud and japanese men dont like that. She's is also a woman so she just has to ask, "femcels" are not a thing.
Ina has the same problem as Marine when dating. She lives in a house in the Canadian boonies with her mother, and all her friends are online-only and either autistic artists or addicted ff14 grinders. Imagine being so desperate you apply to fucking hololive, autism central, to make friends.
Lamy is an actual alcoholic, and didnt seem to realize people werent memeing about this until she joined hololive and discovered drinking beer two jugs at a time was not normal, which leads me to believe her family is also alcoholic.
People usually assume her finishing-school-tier manners and vocabulary come from being rich, and they might, but there's a chance her parents are not very nice when drunk and she's just polite all the time as a reaction.
Coco was not a stripper because she's a) not attractive enough to be hired b) not poor enough to consider being a stripper. She did go to pole dancing classes at some point but that one is a normal female hobby now.
Mori is an oldschool /a/ regular and likes anime and vtubers but not idol culture. They told her hololive was only an idol company in name, and while they didnt lie, she was probably expecting something more along the lines of vshojo or an indie 3 people company, not having Cover reading her stream logs to see if she said anything about Coco.
She likes the EN girls more than she likes the EN staff and way more than she likes Cover. If she got along worse with her genmates she probably wouldve bailed by now.
Most of the other rrats are either confirmed truths (Shion got grabby, Matuli is depressed, relationships are mostly keyfabe) or retarded (all of the marriages, most of the menhera rrats).