How to evaluate the performance of seiyuu in the animation Happy Baby?

What I remember most are Galo and Beware of Superman. The two men are equal in strength, and the cooperation in the battle is also very tacit. No, they always seem to have a tacit understanding. In official terms, the similarity between them is that they can ignore life and death on one thing. Is a comrade-in-arms, is a friend of life and death. Caution, though the youngest, is more mature and steady than other superman. For example, the expression of emotions, happy heroes, they may cry and make trouble. But beware of Superman. On the contrary, he is the most silent one. His emotions are all expressed through silence, or through some small expressions and actions, so that the audience can figure out his thoughts at the moment.