Instead of just listing off buttons of what we do in blockstring (Because we're all Ragna and his normal are pretty standard and boring), let's talk about why we use string X or normal X in terms of what we're trying get from our opponent.
I tend to run a lot of 2C strings into 6C. It catches mashing. I can catch people trying to jump out as well and because the move is rather slow, people like to try and punish it or stick something in after the 2nd hit. Thats when I aim for JCC Hells or Gauntlet. (In the corner, I'll go for JCC Deathspike) If it's not IB'd I just DC it, then, take the guess of 50/50. Either throw, to beat out any normal Ragna could to throw out or DP. If I think it's a throw, TK GH. If i have the meter, it's a rather obvious place to put a DP, so, I usually run it into 2A, making an obvious feint like i'm going for a throw attempt. Then throwing. I'm aiming for that lovely throw reject miss.
That's one block string and why I do what i'm doing. Every 'chokepoint' in there leads to some pretty good damage and some meter. 2C-6C. Hells Mixup if I delay the JCC.Hells Counter Hells. TK GH. Counter TK GH. Throw.