Pretty much all I play is support Lulu, so I'm in my happy place when people pick divers and other hard initiators (initiators are some of my favourite champs in the game kit-wise, too!). I love doing wombos with Lulu; it gives me more potential with my ultimate than just peeling, and you can do insane work with ulted bruisers. My favourites are Malphite (especially if we have an Orianna) and Hecarim. Lulu and Hecarim is such an immense combination -- thank God all Jeb plays is pony! I love ulting Dianas, Irelias, Rivens, and Shyvanas (not that I ever get to ult Shyvanas anymore, lol) as well. I love good roamers as well because I enjoy receiving ganks and counterganks bot, and proactive mid players do so much for the team. Likewise, I fucking hate when enemy mid shows up bot and like to ban Katarina (and other roaming assassins like Kha'Zix, OP or no OP) in draft mode.
In bot lane, my favourite AD carries to support are Miss Fortune, Ezreal, Corki, and (good) Vaynes. I absolutely love good Vayne players, and they are so fun to support if they're not being dicks. Vayne is fun to watch as well, and she can carry so hard if you're willing to let her farm and peel for her. I try to always peel properly, so yeah. I'm not really picky, but my least favourite AD to support is Ashe.
I hate having split pushers on my team unless I believe in the person (Shen/TF being exceptions, naturally) -- I generally assume we're too uncoordinated to execute the split push correctly. Or not even just uncoordinated, just... nobody knows how to do it properly, sick of having them fail on us because either the Teemo (I don't like Teemo players, by the way)/Nidalee sucks or the rest of my team sucks. I like just straight up winning teamfights, and I like playing in teams with good early/mid teamfight/skirmish dominance. That's another reason I like AoE CC wombos -- they are very simple to execute compared to other strategies, such as single-target comps (which require focus). AoE initiation faceroll has less associated worry.
I used to dodge on principle whenever someone picked Sion. He was OP or something when I started playing, except every Sion I played with was a terrible person and a coward as well, no matter how tanky they built, and would lose us the game without fail. I felt the same way about Olaf and Tryndamere, too. Now I always forget Sion is a champion.