For me, it is Zillah. Rahim has been a Syd 2.0. (don't tell him I said that. =P)
https://www.worldanvil.com/w/book-of-the-damned-13leagues
Just go to guides, and pick which season you want. Then at the bottom are links to specific character or personality...etc guides.
Luckily the bar is less friendship/hate and more rival/friendship. Syd and I have a healthy rival relationship. We poke at each other, argue, and got each others backs. I consider her a friend...just a...well...rivalry type friend. xD