While I prefer to work in the shadows and protect my family, I no longer have that option. So if I cannot work in the dark, I will drag my enemies into the light.

Lemon was created by Cheryl from her own DNA and body structure, so that Chii's sexual appetite could be satisfied - Lemon's design function was to be a maid, cook, and sex toy. For the first several months of her life, she served this fuction quite well and enjoyed what she did, having been programmed to love having sex. However, as she also raised Benjamin for Cheryl, she became attached to him, and when he was kidnapped, begged to be allowed to go on the Multiverse Mission. There, she began to quickly develop personality wise as she was forced to confront things that challenged her and the others - she quickly fell onto Cheryl's brainwave patterns for fighting, and became adapt at learning to lead the team, while maintaining her innocent nature.

When Cheryl was taken during the mission, Lemon stepped up to raise the team, a burden that nearly broke her if not for the help of others, like Kane, whom she came to depend on heavily. She also developed a relationship with Jennifer Carmichael, the alternate reality daugher of Warren Carmichael. However, Jennifer eventually betrayed the team and nearly got those Lemon cared about killed, and for the first time in her existence, had to struggle with an emotion she never had before - hate.

After the Multiverse Mission, Lemon has been glad to return to her cleaning duties around the Mansion and Base, maintaining the team's morale and cooking for them. Over the year upon their return, she grew closer to Kane and eventually he proposed to her on Christmas Day of 10-591 - and she accepted. However, when Kane was replaced with a fake unknown to her, the real Kane brought far into the future to protect the timeline. Lemon used some of Kane's sperm from the last time they made love to make a baby named Jenny Chiika. She raised her along with Tomoe and Drake, her adopted children, until Jenny was stolen by the enemy and the memories were erased at the age of 9.

When Kane was returned, and investigations were looked into, they found that Jenny existed and got her back, still at the same age as before and brought her home, where she now had two more adopted children, since Tomoe and Drake were adults now. Adeline and Wade, both 5 years old, joined Jenny and things continued until after Yggdrasil. With a time jump, Adeline used the tree to reach 12 years old and Jenny became 11 years old.

Lemon took over the base operations after Cheryl went missing, running the base as they prepare for new missions.