Pekora's personal From Trauma tier list
S: [Camera], Isshin, Kos, Mohg | Special -> Swarmed by weaklings (Basilisk drawing)
A: Messmer, Nameless King, 「Pre-Nerf」Miquella, Malenia (Giant Hunt), Fire Giant, O & S (mentioned but not added)
B: Artorias, Friede, Lady Butterfly, Maliketh
C: Tree Guard Sensei, 「Pre-Nerf」Baltheus
Biggest Trauma overall -> Mohg
Yellow means most fun so it would be:
Isshin, Nameless King, Malenia and Artorias