Mia and diego (NOT A SHIP POST)
This is debatably the most underrated dynamic in every witch way. I love them so much and i wish session 3 was focused more on them than mia and daniel.
First they're literally some of the closest characters to each other (or should be in theory) they're the only two kanays left and are each other's other half.
Second you can see how close they were to each other in their little screentime. Mia acts as a mentor figure to him on kanay lore and how to properly use his gifts which Diego hasn't had since julio left in s2 and diego acts as a genuine friend to mia (which aside from daniel after the seal she doesn't have). Mia literally cared so much for diego one of her only true emotional scenes was when she was making sure Diego was okay after the shock not to mention she released him from the kanay vow and knowing how important kanay customs and laws are towards Mia this speaks volume
I generally believe if diego spent as much time with mia that Daniel did trying to convince her to lose her hatred for witches and wizards it would have worked if mia heard one of her own sit down and explain it to her