Friendship is also a big theme. In many Ichigo harem fanfictions, the relationships start as friendships. For example, Ichigo could be friends with a group of people, and as the story progresses, some of those friendships turn into romantic feelings. Another theme could be the power dynamics. Given Ichigo's abilities in the original story, how he relates to those in his harem who may or may not have similar powers can create interesting plotlines. The harem members might look up to him, or they could be equals in terms of power, and this affects how their relationships develop.
A sense of community or group dynamic is often explored. The harem isn't just a collection of individuals interested in Ichigo. There are often sub - groups or alliances within the harem. Some members might team up to support Ichigo during a difficult time, while others might have their own rivalries within the group. Also, the theme of self - discovery for Ichigo is common. As he navigates through his relationships with the harem members, he also discovers more about himself, his desires, and his place in the world.