|Character||Anzu's Nickname||Nickname for them|
- Her younger brother is the Ensemble Girls! protagonist. He has no default name, and he is generally referred to by the girls as "Transfer Student".
- During the current Yumenosaki school year, Anzu's younger brother, the Ensemble Girls! protagonist, is enrolled in the Yumenosaki normal course. After the current school year ends, he transfers to Kimisaki Academy, which then begins the Ensemble Girls! timeline.
Anzu's younger step-brother who commutes to Yumenosaki's General Course. Anzu and her younger brother were generally very close, often playing card games as children, and going to the summer festival together each year. Lately, he seems to be interacting less with her, which Tsukasa chalks up to puberty.
For more details, see Protagonist.
- He is the main protagonist of Ensemble Girls!, which takes place the year after Ensemble Stars! and at the same time as Ensemble Stars!!.
- They were confirmed to be step-siblings in the Ensemble Girls! story Sleeping Beauty.
- Unlike Anzu, he does not have a default name, and is simply known as 転校生 (Tenkousei, Transfer Student). Similar to Anzu, who transferred to Yumenosaki, he transferred to Kimisaki Academy (the school featured in Ensemble Girls!).
- In Devils, it's noted that Anzu adores her younger brother greatly and is troubled by his recent distance toward her.
- In Yumenosaki Youth RADIO, Anzu carries a handkerchief on hand for her little brother.