Laura Brown
Laura Brown's character was modeled after Septimus Warren Smith in several ways. Like Septimus, she has a loving spouse who cares about her more than she cares for him. She is a shy person who would rather be alone than around people, like Septimus' antisocial attitude after the war. Septimus had a male lover in the war who died during battle and Laura kissed her neighbor Kitty who might have cancer. One of the most obvious reasons the two characters are similar is because Septimus committed suicide and Laura tried to do the same but ended up only leaving her family. Both of them had a loving spouse and Laura had two children but their mental illnesses prevented them from seeing the positive things in their lives.
Dan Brown
Dan Brown and Richard Dalloway are both clueless husbands who love their wives and go to work everyday but do not realize that their wives are unhappy. They both play in to the flower imagery by buying their wives roses and though it is clear to both the husband and the wife that they mean to say that he loves her, neither of them say it out loud. Neither character plays a big role in either novel but they are referenced and thought of throughout each story.
Richie Brown
Richie Brown, who we later find out is Clarissa's friend Richard is like both Septimus and Peter Walsh. Clearly, Richard and Septimus are both mentally ill men who kill themselves by jumping out of a window on to concrete. They are sick of being a different person than they used to be and after realizing they aren't going to get any better, they decide the only way out of their misery is through death. Clarissa Vaughan and Richard had a relationship when they were younger but they did not end up together, just like Clarissa Dalloway and Peter Walsh. Richard and Ms. Vaughan still love each other and often think about how things would be different if they had married. The same is true for Peter and Mrs. Dalloway except they hadn't seen each other in a long time, while Richard and Ms. Vaughan probably see each other every day.
Kitty
Kitty shares one kiss with Laura and Clarissa Dalloway shares one kiss with her friend Sally. Both Kitty and Sally are representations of what Laura and Clarissa strive to be, not because they are perfect, but because either people like them or they are unique. No one ever tells about either kiss and it remains a secret for the rest of their lives, taunting Laura and Clarissa, forcing them to ask themselves what they really want in life.