A reader could describe the relationship between Hero and Claudio as idealistic instead of realistic. A previous answer mentioned that it was love at first sight between the two characters. I have no problem supporting that concept. We are told that Claudio looks “upon her with a soldier’s eye / That liked, but had a rougher task in hand.” Those feelings develop into love while Claudio is away, and it seems that Hero reciprocates his feelings. The reason I see their love as idealistic is because there isn’t much talking that the two of them actually do. In fact, Claudio enlists the help of other characters to help woo Hero. It reads like something straight out of junior high. Their relationship is very superficial through most of the play. They like the idea of being in love with each other; however, their relationship is almost brought to an end for really nothing other than a failure to communicate with each other and trust each other.
A big key to understanding the relationship between Claudio and Hero is to compare it to the relationship between Benedick and Beatrice. Their relationship is the more realistic, true love. It is based on mutual respect, trust, and communication. They don’t happily get along all of the time, but they are capable of looking past each other’s rough edges in order to see the love that is buried deeply between them.
Hero and Claudio are an example of love at first sight. They are set to marry when Claudio asks, but Don John causes a significant bump in their relationship, as he sets up Hero as having cheated on Claudio with her sleeping with another man (when it was actually Margaret). However, as a comedy, Shakespeare sets them both back together as a perfect couple as Dogberry, Verges and Seacole proves Hero's innocence. As epollock said, their marriage is heavily contrasted to Benedick and Beatrice's relationship and marriage.
Much Ado About Nothing contrasts a conventional couple with an eccentric one. Hero and Claudio are so conventional that they rely on the proxy courtship typical of arranged marriages. They were attracted to each other before Claudio went off to war. Claudio speaks of his love for Hero indirectly, seeking Don Pedro’s permission to marry. On Claudio’s behalf, Don Pedro asks both Hero’s father and Hero herself. A misunderstanding follows about whether Don Pedro is courting on his own behalf. Don Pedro’s brother, Don John, is responsible for creating a misunderstanding between Hero and Claudio. They are contrasted to Benedick and Beatrice.