Need a tanky supp to add to my roster!

I'm a support main. My issue? I HATE the tank supps I've tried. Alistar has little use outside his headbutt/knockup combo. Braum only partially fits my play style (I hate sacrificing myself for the adc when if I were playing, for example, Nami, we could both get out easily) but not my fave. Thresh and Blitz are alright, I do own and play Thresh, Blitz is a POTENTIAL next buy.

I feel like my supp roster is incomplete without a tank. My main issue is tanks are typically highly immobile. The only tanks I really play are Irelia, who is a juggernaut and is mobile and thresh, who has enough cc that his inward-only mobility doesnt bother me too much.

My baes are the nature babes - Janna, Nami, Zyra. I also play Thresh, Karma, Lulu, Orianna, and Soraka. When I'm not supporting, I play champs like Irelia, Akali, etc. with the exceptions being Lux and Cass, who are immobile but thrive on enemy immobility and Maokai (jungle only), who is semi-mobile while being tanky as a mofo to allow time for just walking right out.

I used to do Galio supp, mostly back when mages were hardcore ruling Summoners Rift, so he's another one I'm considering. I played Taric support shortly before the pre-season patches where he became a god due to AD champs being cray, but with his rework coming at some point in the near future, I'm hesitant to main him.

TL;DR: I need a tanky supp champ to add to my roster. I like mobile or immobile-thriving-on-immobility champions. I hate Alistar. I'm considering Blitzcrank, Galio, and Taric. Any suggestions are greatly appreciated, as well as reasons why you think I'd like them.