Alistar

Has good engage and dis-engage, you can follow him nicely, plus his passive heals you in lane

Blitzcrank

Great way to get a lead in early

Bard

If bard is really good, you will win always, if not, he will lose your game. 50/50

Brand

He will take your kills, but he can zone enemy adc from farm, and punish him if he goes for it

Braum

You can follow his engage, he can protect you

Janna

Has great shield, heal, way to slow/knock up enemy - prepare them for your E

Leona

Nice way to get ahead early, snowball then

Lulu

Lulu if perfect with vayne, she benefits from high attack speed adc's, and vayne is one of those

Morgana

Can protect you from cc by her black shield (E). Also great long during immobilize (Q)

Nami

She can heal you, boost your aa, and do some cc

Nautilus

Great engage - good to snowball and catch enemy off guard, once they do any mistake

Pyke

Seraphine

Has nice ult, can snare enemy - prep them for ur E

Rakan

Great synergy, he can engage, poke, heal you, save your ass. He can do it all, and you can follow him up

Soraka

Helps you to stay in lane to farm - you will be immortal in late

Swain

nice cc, insane dmg, he will take your kills most of the time

Taric

nice engage with E, can give you some armor, heal you, and make you unvincible

Thresh

If he is good, you can follow him, and destroy enemy botlane, also he can punish enemy misspositioning

Zyra

Zyra has great damage, snare, and you can fight anything with her