Start of a Civ game, scouting around, who are you pleased to meet, and who makes you say "oh no, not you again"?
For me, favourites:
Zara Yaqob - usually starts Pleased, and will declare war on anyone for a tech or two!
Gandhi - Good trading partner, unlikely to DOW on me, and doesn't mind if I make arrogant demands. Also tends to get picked on by everyone else, which means they're less likely to come after me.
Least favourites:
Gilgamesh - Protective, so hard to attack, and a bit of a warmonger who seems to regularly pwn me with stacks of Vultures. Seems to tech up fairly quickly too (maybe it's those Ziggurats).
Isabella - Either she hates you and will attack, or likes you (you accept her religion) and keeps demanding stuff. A bona fide PITA either way.
For me, favourites:

Zara Yaqob - usually starts Pleased, and will declare war on anyone for a tech or two!

Gandhi - Good trading partner, unlikely to DOW on me, and doesn't mind if I make arrogant demands. Also tends to get picked on by everyone else, which means they're less likely to come after me.
Least favourites:

Gilgamesh - Protective, so hard to attack, and a bit of a warmonger who seems to regularly pwn me with stacks of Vultures. Seems to tech up fairly quickly too (maybe it's those Ziggurats).

Isabella - Either she hates you and will attack, or likes you (you accept her religion) and keeps demanding stuff. A bona fide PITA either way.