You can't help but love Asterion. Outside of him, I'd say my favorite characters are both Luke and Kota. Luke while seemingly so carefree has given the impression of a tender big brotherly side (given what content we can delve into), and it's adorable. Kota, coming across as the stoic fatherly side of the group, masking all those years of longing and pain immediately captured my heart in his story (and I hope all the best finding Onsen).
Now all the other characters I still absolutely love, and I want to bear hug them dearly. I recently started shipping Khenbish with Nikos. I can see their personalities balancing each other out. And knowing what I know about Robert, I pair him with Luke lol.
Pedro and Oscar's dynamic are so perfect for their coming together. As long as Pedro continues to open up (which he's taken leaps and bounds in Chapter 19)
Themba is my wild card, I need a bit more of his back story (which in some ways, Khenbish's father is just like his own) before I can put a pin in his number card. He just seems to be pleased as long as he's with his Uncle Asterion.