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I don't think you can really go wrong between Blade, Void or Hyperion, it might come down to what you are going to use them for. A 5* duped Blade with his regeneration is super useful for story and event quests, he saves you a lot of units.
But if you are trying to tackle Act 6, I'm not sure cause I haven't started that yet. Would love to know what you end up doing and why!
Just to give more idea. This is my current roster.