Blame-Eater:

A person who happily accepts blame for things they didn't do, mostly to take the pressure off others and/or to assuage someone else's feelings, and also to avoid arguments and end the silliness of the blaming conversation. The blame-eater is comfortable enough in knowing themselves so as not to worry what others think, so the blame disappears in a puff of smiles.
John can be a bit blaming. Luckily, Jane adores him, doesn't want to fight, and doesn't mind being the blame-eater.
"So it's my fault now? Okay, I'll take the blame. Let's hug."
by JaneGordon.com February 2, 2023
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