Leo[1] is a Helper, owned by Hamilton Smith-Rawnsley. Hamilton keeps Leo, Andromeda, and Cassiopeia locked in a single room [2] which they are never allowed to leave[3].

Despite the abuse he faces, Leo has so far seems to have made very little progress in fighting his programming[4][5], which might be due to his young age[6][7].

Leo is a hardcore fan of Our Little Helper and Marigold[8][9].