If there's anyone out there who could break Amumu's curse and be his first friend, it would be BRAUM

Not really considering there's another, obvious champion who could and probably would be Amumu's friend, has a name rhyming with fern and also actually has the power to potentially both survive and cure Amumu's curse.

That, or, we have a sad story of Braum trying to help Amumu, but he too is affected by the curse, but he just can't help this sad little kid, so he ends up turning to dust trying to save him.