actually I do mourn what hoo did to Percy and Nico's relationship because in pjo it was such a hilarious love-hate thing. Like Percy's this long-suffering and exasperated but protective older cousin figure while Nico is Nico and is feral and dramatic and craves Percy's approval while also loathing him at the same time. Like. Amazing stuff at play there.
Then in hoo Percy's like Nico? yeah he can die I guess and listen listen I'm not saying its out of character for Percy to be vengeful or for him to be annoyed by Nico. Like I think its very on point (see him strangling Nico for betraying him in tlo). However, I think the way it should have played out is Percy being fuming at Nico in his head but the moment Jason and Leo are like "Nico's shady so maybe we shouldn't rescue him?" an instant switch flips off and Percy's like "Um only I can talk shit about Nico and we're going to save him because if he's going to die its going to be by my hand"