Ahaha Gwen! ❤ Just answered 4 and 13 here!
As for the rest:
what is your character reluctant to tell people?
Anything in detail about his time with Thanos. Loki would rather be thought a heartless bastard than confess that he was ever vulnerable and humiliated because Asgardian culture, for all its medical advances, still has zero concept of mental illness and how to treat it.
what would your character make a scene in public about?
Loki isn’t a scene-in-public person. The only time he was ever reduced to this raw of a state was directly in the wake of Thanos’s custody, in Avengers Assemble, when he was utterly frantic to win Midgard and the Tesseract in exchange for his freedom (”life’s great lie” :’) ). Nowadays, and contrary to popular belief, Loki is far from an “attention whore,” an extreme introvert and background strategist who is mortified by being the focus of attention or scrutiny. Which is exactly why, when he was in a fucking fishbowl in The Dark World care of Odin, it was such a cruel punishment.
for what would your character give their life?
Welp. We just saw, didn’t we? And I always knew it was true: Loki would give his life for Thor’s safety. My Loki muse would also die for his spouse or children. For people, Loki would die. But never for a cause or idea. True Slytherin.
what is your character afraid of?
Being replaced, insignificant, unremembered. All of these things, in spades, by Thor, because not only is Thor “all he has left,” Thor still connotes all things wholesome and worthy to Loki (betrayed by the deleted scene in which he fantasizes in his cell about wielding Mjolnir and wearing a red cloak, just like his big brother). My particular Loki muse also fears losing his children, or seeing them harmed, particularly by enemies he has made. He also fears the repetition of trauma he’s endured under Thanos and minions; he will long after these people are all dead, because PTSD is frankly an intractable mental illness with cognitive-emotional associations that ruin otherwise safe everyday things and people, that you simply learn to live with. Finally, Loki is afraid that when he dies, and permanently dies, he will never earn entry into Valhalla, and see his mother again: or the rest of his family, when they, too, die. He’s afraid his afterlife will be lonely.