Atashi is not an actual character from the series Cardcaptor Sakura. The term 'atashi' is the informal Japanese first-person pronoun used mainly by females to refer to themselves. In Cardcaptor Sakura, main characters include Sakura Kinomoto, Syaoran Li, and Tomoyo Daidouji, among others. Since 'Atashi' does not correspond to a specific character, there is no established role or background for this name in the series.