I really don't think these need to be animated to demonstrate things like Speed, Strength, Chi, or Toughness. You could convey these sorts of things just with static symbols or objects. If you want all of them to be animated, that's different, but 'Strength' is done very, very differently from the others, then.
A flexing arm for strength works fine. For speed, you could probably have a winged shoe/sandal, or just wings. Toughness could be a shield, maybe. Chi... not sure, maybe some sort of energy ball or a spiral shape.