Nico found out that the dead don’t get to eat or taste or see anything so he summons them just so that their afterlife isn’t so sad/lonely/stagnant
Nico jumping around the world visiting random people, and he keeps bumping into the hunters, and they're all awkwardly staring at each other before he makes an awkward excuse to go away
Nico just knows everyone in different pantheons, and is on good terms with them
Nico is a baby gremlin, and adorable, and the only place where he isn't accepted is camp half-blood, and camp jupiter