Riku has a Keyblade. (Which confuses me because Sora's Keyblade is supposed to be Riku's... but whatever.)
And in KHII, Kairi gets a Keyblade and only uses it briefly.
[hider=SPOILER]At the end of DDD, Yen Sid calls Kairi in get formal training with her Keybalde.[/hider]
But yes, all three of them have Keyblades.