Taric, Sona, Nunu, Alistair.
Taric- usually pick against ez. The stun holds him nicely before he gets away. Best all around (peels, sustain, can soak DMG, good for winning exchanges, cant dive him). Great counter to blitz. Force pulls on yourself, then stun and attack the enemy ADC.
Sona- works well if you are on an aoe team or poke team. I find she lanes best with Miss Fortune. Their ults together win games. Very easy to play. Doesn't soak damage well at all or peel very well.
Nunu- he is a good mix between Taric and Sona. He soaks up lots of damage and has the ability to poke and harass. Using his ult can really save your carry. They either stand in it and get killed or they flash out. Either way it's good for you. His blood boil seems to work best with Draven or Kog'Ma. I find he doesn't do well against poke teams. They out range him.
Alistar- He is banned for a reason. I think he can really carry bot lane. He provides the most protection, some sustain, and can really set up kills for your ADC. After lvl 6 he is practically unkillable.
I do play some Blitz, but I find he is always banned. When he isn't, you usually have somebody pick him that doesn't know how to play him. They just pick him because he is "op" and they think they can't lose with him. Just catch him off guard and use the strategy I mentioned earlier. Make him pay for grabbing you. Use Taric, Leona, or Alistair against him, and let him pull you to his ADC. It's like he set up a kill for you. Morgana support is good as well. Spell shield makes his pulls useless.
This is what has worked for me, and I cannot promise it will work for everyone. You have to find your own style of play. Although, I do hope my advice has been some help.