Alice Mizuki
Mizuki Alice (瑞城 ありす, Mizuki Arisu) is a female of unknown age, but seemingly around 13, attending the same school as Iwakura Lain. She is also Lain's best friend.
Alice is introduced in Layer 01 as Lain's classmate. She shows a greater concern for Lain than Kato Juri or Yamamoto Reika. It is due to her encouragement that Lain first visits Cyberia.
It is revealed in Layer 08 that Alice has an affair with a teacher in her school. Evil Lain spreads this information through the Wired, and although Alice wants to believe Lain did not do it, evil Lain appears in her room and laughs at her. Lain eventually deletes everyone's memories of these rumours - except for Alice's.
In Layer 12, Lain says that Alice is special because she became Lain's friend before she connected with everyone through the Wired. Alice teaches Lain that there is still value in having a physical form, placing Lain's hand over her heart to feel her heartbeat.