Zagreus has always had a sense that he doesn't belong in the House of Hades; recently, he has decided, against his father's will, to escape from the Underworld no matter how many tries it might take him. He's aided and encouraged in his journey primarily by his caretaker Nyx and his mentor Achilles, with others outside the House of Hades, such as Sisyphus, Charon, and the Olympian Gods, sometimes offering their aid as well.
Zagreus is met with numerous obstacles throughout the realms of Tartarus and Asphodel. He is mostly faced with various aggressive shades working for his father, but he also has run-ins with the Fury Megaera, and with the skeletal remains of the Lernean Hydra. These battles, combined with the dangerous landscape of the Underworld, always serve to bring a painful end to Zagreus' escape attempts sooner or later.
Codex Entry Edit
'...Take one look at him and I think any questions of his parentage are soon resolved. He never seemed to like it much, there, growing up within Lord Hades' well-appointed house. One day I took him on as a disciple, under orders from Lord Hades; the Master worried that his heir lacked any firm direction in his life. And, indeed, Zagreus took well to the martial ways, and I am proud to say now that he was my student. Listen, Mortal. You are not supposed to be reading this. You are most bold, or most unwise, to have been digging through these arcane texts, or to have gleaned the knowledge from someone who has. Sometimes, herein, you may find traces of the weavings of the Fates. That is true. At other times, however, your attempts to glean the future shall be thwarted. Best not to spoil the surprises that the Fates may have in store for you, if you ask me. For the Fates work in mysterious ways, and defy prediction; remember that.'
Zagreus is a person who is calm and has a dry sense of humour. Which can be seen when he make quips and one-liners toward the many wretches of the Underworld who stood in his way. He is also very forgiving as he accepted the apology from Nyx(whom had lied to him about being his mother). He also (possiblly) doesn't hold grudges to Megaera for killing him countless times simple because he knew she was simply doing her job.
He holds his mentor,Achilles in high esteeem as he was the person who taught him how to fight using different weapons. He loves and cared for Cerberus greatly.