Remona

　　,∧＿∧　　　　／￣￣￣￣￣￣￣￣￣￣￣￣￣
　 Ｘ ノ ﾊﾍ X　　　|　 わたし「レモナ」、モナー君と同棲中。キャ♪
　 |ﾟﾉ ＾∀＾）　　＜
　§,　　　 ）　　　 |　　モナ板のみんな、これからもよろしくね！
　 !!|　 Ｙ　|　 　 　 ＼＿＿＿＿＿＿＿＿＿＿＿＿＿
　 （_＿）＿）

Remona is Mona's girlfriend.

Remona: Origins

　　ＸΛ＿ΛＸ　　／￣￣￣￣￣
　　（　＾∀＾）＜ オレモナ～
　　（　　　　） 　＼＿＿＿＿
　　｜ Ｙ　|
　　（_＿）＿）

Remona was originally just a version of Mona with Xs next to her ears, and their name was "カチューシャ"/"Kachuusha" which translates to "Headband".

Kaschuusha was a creepy stalker and a crossdresser¹.

Derivatives

Morena

　　 　　 x∧∧x　パパ～♪ママ～♪
　　:=∽(ヽ^ヮ^))
　　　 　_ｿ　､ﾉ´
　 　 　 ﾞｰヽ_,)

Mona and Remona's daughter. In the lore of the thread where she was created, Mona and Remona were created as bioweapons, so she is also a powerful fighter.

Black Remona

　　,▲＿▲
　 ＋ノ ﾊﾍ ＋
　 |・ﾉ "－"）
　§,〓Ｂ〓）
　 !!|　 Ｙ　|
　 （_＿）＿）

Black Remona was a bioweapon created to destroy Remona, but she was defeated by Remona's kindness, and became an "older sister" figure to her.

¹This characterization feels really transphobic.²

²Not that I expect the average Japanese person from the 2000's to have an accurate understanding of what transgender people are actually like, but still.

Sources:

• Nameless Rumina Wiki
• 2ch AA Illustration Project
• 2ch AA Illustration Project (Morena)
• 2ch AA Illustration Project (Black Remona)