I should check if there's any official releases in 2021 related to these characters. RWBY does have anime-style animation, but it's not a hybrid with other anime. There might be a fan-made project or mod that combines RWBY elements with other anime, which could be what they're referring to as "The Fullanimat". Alternatively, maybe the user is confusing "Fullmetal Alchemist" with "Fullanimat"?
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