The ones I love the most (some off-meta, here):

For all but Rakan, my build is basically the same, which I'll show below. Sometimes I'll switch it up, but tank supp + aftershock + this build has worked consistently for me.

is amazing for early harass. He's unexpected and always underestimated. Early Qs HURT, W lets you win the 2v2 trade every time, and a good EQ combo almost guarantees a kill on an immobile opponent (flash/escapes on cooldown if they have any). Global ult makes you a threat everywhere, and since you're down in the bot lane, people will forget this, like, everywhere. Turn a 1v2 to a 2v2 top (or a 3v2 if your jungler is also on the way), etc. Shen is amazing here.
is just king of the beefcakes. His healing passive is great for lane sustain, and he's got three forms of hard CC. One on each basic ability. So he's got PLENTY of ways to proc Aftershock. The headbutt>pulverize>trample combo is really good and pretty standard/reliable. You can also pop out, headbutt first, pulverize to keep em locked down while you use trample and then keep em CC locked for a couple seconds. His ult is also great in every team fight, for tower diving, soaking skillshots for your ADC, etc. All around, the cow is fuckin awesome.
's shield alone is incredibly annoying, but concussive blows is scary good, his Q is great consistent harass, and his WE are both great for defending in a pinch. Jump to your ally, beef em up, soak all enemy skillshots with your shield while your ADC unloads for free, and you've got a good trade. The ultimate is also amazing, and incredibly reliable. Fantastic to keep people locked down. Fantastic for negating skillshots. Great zone control with ult. All around, Braum is awesome.
is just honestly a pain in the ass to deal with. hard CC + bonus damage on his first auto is great for harass. QEauto/QautoE is good lockdown, and will usually force an enemy flash. Also, his W makes him a tanky monster that no one has a fun time dealing with, at really any stage of the game. Ult is also great lockdown, AND it's targeted. So, that's nice.
is one of my favorites of all time. I start E +
with him, for what I assume are obvious reasons. Free wards, plus early access to denying vision. It's nice! His passive is also great sustain, his Q is both hard CC AND a slow, his W is point and click hard CC, his E is long range harass, slow, vision, and %HP damage. His ult is also AMAZING for zoning/lockdown, like basically everyone else on this list. Maokai is not fun to deal with in the botlane.
, pretty simple. Good sustain with shield and heals, great mobility. Long-range initiation if you E to an ally, flash-W in. Ult before you W and now you've got instant, long-range CC, but it comes with sacrificed length. He's quick, he's reliable, he's got heals, shields, AND hard CC, and he's very mobile. Not really anywhere you can go wrong with him once you've really put time into him.