Yari no Yuusha no Yarinaoshi - Vol. 8 Ch. 38 - Seeds of Laziness

[MangaDex]

 

[Gokuto]

Theres 5 factors that affect Filo eggs

Spoiler: Sakura

Sakura is Filo but the circumstances of her hatching makes her look different. They're affected by Chimera meat, the hero who hatches them, naofumi's emotions, if theres an older sister figure. 4th is the mood of the party i believe and the 5th is unknown