Porter

A moody dhole who dislikes people, tolerates his retail job, and keeps the mysterious creature he found living under the docks a secret...

He's left home in recent years, happy to be rid of his father, and has been trying to find steady work anywhere he can. His work ethic usually keeps him employed, but he's always wishing he could be hired as an editor or writer more than anything.

His siblings are unsavory characters that will take advantage of Porter if he's not careful and have already drug him into more than a few ordeals.
While Porter tends to be a cynic, his will to prove people wrong is stronger. Being around people like his dad and older siblings often causes him to be obstinately upstanding in contrast.

One fateful evening, down by the local docks, he encountered an otherworldly beast and was given a few scars (due to what was later regarded as a misunderstanding).
The few people he mistakenly told about the incident didn't believe him and humiliated him. Porter would rather pretend he lost a fight than have people think he invented such a tall tale for attention, so he stays quiet about it.
Sigma is a being of few (telepathic) words. Due to him being part spirit he is usually able to phase in and out of the living realm to avoid being seen. To Porter's dismay Sigma began appearing on Porter’s walks, at his place of work, and his house. Though this supernatural guardianship is turning out to be a huge benefit to Porter given that he's been stumbling into increasingly strange and other-worldly entities and areas. Reality-bending liminal spaces litter his town more and more and it's not uncommon to have trouble escaping them or even have run ins with their enigmatic wandering entities.