Quote 1, from the series Magnus Chase and the Gods of Asgard:

The following quotes are all on the same two pages so I'm smashing them all together into one.

I should introduce my sword.

Jack, these are the peeps. Peeps, this is Jack.

...

When I need his help, he turns into a sword and kills things. Sometimes he does this while I wield him. Other times he does this while flying around in his own singing annoying pop songs. He is magical that way.

...

"What's going on?" He asked. "Who are we killing?"

Jack claims he doesn't pay attention to my conversations when he is in pendant form. He said he usually has his headphones on. O don't believe this, because Jack doesn't have headphones. Or ears.

"Chasing assassin," I blurted out, dodging a taxi. "Killed goat."
"Right," Jack said. Same old, same old, then."

...

I'd seen enough of the Nine Worlds to know that jomanoid didn't mean human. He could be an elf, a dwarf, a small giant, or even an ax-murderer god. (Please, not an ax-murderer god.)

-Pages 14 & 15, The Hammer of Thor

Guesses here! >>>