Can anyone give me ideas for my manga to draw?

it should be about a orange hair girl like orihime and her brother do not get along like rukia and byakuya. the girl should have a similar relationship like orihime and ichigo with a boy. the genres are fantasy, romace, slice of life, action and adventure. the girl should have powers that take the form of chibis one of them for fighting which will fuse with the girls heart, one with healing powers, and one with sheilding powers. also her brother disappears mysteriously and then one night the girl finds im fighting demons and then she finds out about what is really going on around her. thanks in advance.