Along with Yoshimasa's wet nurse Imamairi no tsubone (also called Oima) and the cousin of Yoshimasa's mother Suketo KARASUMA, Mochiie was known as an influential aide to Yoshimasa, and these three were called 'Sanma' (three 'ma') because their names, Oima, Karasuma and Arima, all include the syllable of 'ma' in them.
義政の乳母・今参局（御今）および義政の母の従弟・烏丸資任とともに義政側近の有力者として知られ、「三魔」と並び称された（おいま、からすま、ありまと、「ま」がつく三人）。