That's vague. What's the title, if you can remember?Recently there's been that not great tensei, idiotically tagged as isekai, that has a main character that looks similar to Illyasviel with heterochromia.
No, it wasn't. It was originally what looked like an obvious typo in the Fate/complete material profile for Artoria (as in the non-Alter version), the same source that explains the etymology of the name Artoria. It's also one of several different romanizations that Type-Moon inconsistently used over the past decade-plus since the Fate/stay night VN was released, before they apparently settled their minds on Altria come Fate/Grand Order's English-language debut, even when the English localizers tried to argue otherwise (yes, you read that right: for once the localizers actually got the translation right and it's the Japanese owner who is being nonsensical and mule-headed)....wasn't Altria Saber's Alter altered name's altname specifically? ("Bob Loblaw Law Blog")
Fate/complete material
Fate/Grand Order's