Here is a list of Servants with Brynhildr’s Beloved trait. Those servants are weak to Brynhildr's Noble Phantasm, Brynhildr Romantia.
Rashoumon event (Ibaraki Douji event)
Murder at the Kogetsukan
Inheritance of Glory
FGO Reroll Tier List [5/11 updated!]
Best Craft Essence: Craft Essence Tier List
First Sunrise
Void's Dust
EMIYA (Alter)
Arthur Pendragon(Prototype)
1st Singularity: Orleans
Ereshkigal
Gorgon
Black Holy Grail (The Black Grail)