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Xenoblade Chronicles 2's shield-hammer class could use a bit of a buff, in my opinion. This isn't because it's necessarily "bad": the issue is that it's a tank class in a game where the drivers that were "meant" to be tanks either are either a dodge tank (Morag) or restricted to only using three blades (Tora).
That being said, Electra is a solid choice for tanking due to the fact that she has a whopping 78% block rate. Adding in the 50% chance to completely negate damage via the Ultimate Shield Aux Core, you'll be surviving incredible hits without any trouble.