Another place, Trinity

My Best Friend has been coming up with story ideas non-stop
It kind of displeasures me to say this, but... i feel i can help him with this. But not alone
He is creating a story he likes to call "SideLand", this story's prologue (which has nearly been finished) basically states that three creatures gave their own entirety to rebuild a purely empty universe, of course he also told me that... By doing so, the three created life, and some of this life became "embodiments" physical representations of their most defining traits, including "Sloth", "Wrath", etc
But their universe also took the embodiment thing a bit seriously, and even created a representation of Death, made from one of the three's fear of death
The embodiments include almost any fear hope or trace of something like bravery!
Does anyone have any ideas to help him?