Suzuha Amane/Plot

Alpha Attractor Field
At the start of the story, in the Beta Attractor Field, Suzuha safely lands her time machine on the roof of the Radio Kaikan building. What happens afterwards is not shown, as the Attractor Field switches to the Alpha Attractor Field shortly afterwards, in which the device's coordinates are slightly off, causing it to "appear" inside Radio Kaikan's upper floor, damaging itself and the building. Regardless, Suzuha manages to acquire a MTB bike and a phone and seeks employment at the Braun Tube Workshop owned by Yugo Tennouji in order to get close to the Future Gadget Laboratory.

Part-Time Warrior
Okabe first encounters her when she applies to work part-time at the Braun Tube Workshop. She appears fairly frequently but is often slacking off due to the Braun Tube Workshop's unpopularity. He christens her "Part-Time Warrior", due to her statement that she is a soldier. She forms a close relationship with Nae Tennouji but always glares menacingly at Kurisu Makise whenever she sees her. She believes Kurisu is a SERN conspirator because she is hailed as the "Mother of Time Machines" in 2036, unaware of the fact that Kurisu's co-operation with SERN was probably involuntary. As John Titor, she exchanges mail with Okabe and posts on @channel, although no one is aware of her identity.

Search for Father
Suzuha attempts to meet her father at a time machine offline meet she knows he will attend. However, this meeting is prevented by an unknowing Okabe, who prevents Daru from going to the meeting. Unable to meet her father, Suzuha leaves after sending a mail containing the single word "Goodbye" to Okabe. She uses her time machine to leap to 1975 and obtain the IBN 5100. However, these events change after Okabe sends a D-Mail so he would pursue Suzuha and prevent her from leaving. She remains in Akihabara, although during this time the time machine is damaged by a storm. Okabe dubs her Lab Member no. 008 after accidentally telling her about the PhoneWave's existence.

Last Supper
After the completion of the Time Leap Machine, Suzuha attends the celebratory dinner with the other lab members. During the party, they watch a news station report that a terrorist threat caused the train station to close. Immediately realizing what is going to happen, Suzuha quickly leaves the lab. While she is gone, Moeka Kiryu and several Rounders attack the lab and kill Mayuri Shiina. However, Suzuha shows up and defeats all the Rounders. While in a standoff with Moeka, she reveals to Okabe that she had turned on the 42" CRT TV, so the time leap machine is in working condition. She holds off Moeka, giving Okabe enough time to use the time leap machine to jump back in time.

John Titor and the Time Machine
After attaining Worldline Divergence 0.337187% and repeatedly using the Time Leap Machine to try and prevent Mayuri's death, Suzuha listens in on Okabe when he tells Kurisu about how he has time leapt over and over again, and runs away to her time machine in regret of having stayed to travel to 1975. She is found by Okabe who confronts her, and she decides to tell him the truth about time travelling and being John Titor, and they walk back to the Future Gadget Lab so that Suzuha can tell everyone about the details. In the anime, Suzuha who had been listening in on Okabe's and Kurisu's conversation, instead confronts them directly and takes them to the time machine. She explains what worldlines are and reveals the truth about her identity as John Titor and what the future has in store. She then reveals that the time machine was damaged by he storm the other day and she had no means of fixing it. After the group is forced to leave to avoid being spotted by security, Okabe enlists the help of Daru and Mayuri to both fix the machine and find Suzuha's father. While Daru attempts to fix the time machine, the rest of the group use a pin belonging to her father that she brought from the future to attempt to identify him, but are unsuccessful. Daru attempts to get a copy made so he could pretend to be her father and make her feel better, but Okabe shuts down the idea. After fixing the time machine, Suzuha prepares to leave to 1975 and obtain a IBN 5100, but Mayuri interrupts and reveals to the group that she has managed to work out that Amane's father is Daru. The two have an emotional "reunion" and Suzuha leaves in the time machine, sending Okabe a mail containing only the word "Goodbye".

Amnesia
Unfortunately. Daru's repairs were incomplete and the time machine malfunctions. Although Suzuha makes it to 1975, the violent crash leaves Suzuha injured and unable to fight back against the rounder who followed her. The rounder easily incapacitates her before throwing her off the top of Radio Kaikan. While Suzuha survives, she is left amnesiac and only remembers herself as "Suzu Hashida". She later aids the young Yugo Tennouji, renting him a place in her home and acts as his mentor. In 1999, her memories of 2010 return and she suffers a breakdown. She realizes that she failed to obtain the IBN 5100. Over the next year, her mental health worsens and she writes a farewell letter to Okabe, telling him of her tragic fate, and entrusts it to Yugo, who gives it to him in 2010. After writing the letter, Suzuha hangs herself. Her body was later found by Yugo.

Irreversible Reboot
On these worldlines, the events of WorldLine Divergence 0.337187% recur endlessly due to Okabe being unable to decide between saving Suzuha or Mayuri, so he repeatedly uses the time leap machine to re-live the two days Suzuha spends with the lab members endlessly. However, after possibly hundreds or thousands of loops, Suzuha realizes time is looping and confronts Okabe. After discovering the truth of her suicide, she asks him to come with her to 1975 to ensure that she will not hang herself and will secure an IBN 5100. Okabe's emotions begin to reemerge after this. The two enter the time machine and travel to the past, and what happens to them is left open.

1975
After Okabe prevents himself from stopping Suzuha from leaving after her failed meeting with Daru, she leaves in the unbroken time machine and her memories remain intact after the journey. She secures an IBN 5100, becomes a university Physics professor, and mentors Yugo Tennouji, Shouichi Makise, and Yukitaka Akiha under the name "Suzu Hashida" (which suggests that she figured out that Daru was her father, despite not confirming it before travelling through time). However, she dies in 2000 at the age of 43 from an illness caused by her time travelling. Her Divergence Meter passes into Yugo's possession while the IBN 5100 is given to Yukitaka, and a 42-inch Braun Tube television is left to Yugo. Unlike on Worldline Divergence 0.337187%, she does not die in anguish and accomplishes her mission, passing on the IBN 5100 to Yukitaka who in turn delivered it to Yanabayashi Shrine for Okabe in the future.

Beta Attractor Field
In the Beta Attractor Field, World War III breaks out. Daru invents the complete time machine that can travel backwards and forwards in time, which Suzuha uses to travel to 2010 to convince Okabe to stop Shouichi Makise from going to Russia with Kurisu Makise's paper on time travel and change the future. This Suzuha is aware that Daru is her father. Her personality is slightly different from the Suzuha in the Alpha Attractor Field. She and Okabe go back to the day of Kurisu's death in an attempt to prevent the beginnings of World War III.

Steins;Gate 0
When Okabe refuses to attempt to go back in time again, Suzuha is angered, but is convinced by Mayuri and Daru to let Okabe come to his own conclusion. Not able to waste more fuel for the time machine, Suzuha remains in 2010 for the next six months, posing as Daru's younger sister.

While in the past, she interacts with the friends of the the lab as well as her mother. She eventually encounters an older, but amnesiac Kagari and begins working that the Braun Tube Workshop. After Kagari's disappearance, Suzuha is again unable to locate her.

Six months later, while in the shower, Suzuha is attacked by a masked assailant revealed to be Kagari. When Kagari takes Daru hostage, Suzuha threatens to kill her, forcing Kagari to retreat after grabbing her Upa.

As the lead up to WWIII increase, Suzuha is approached by Mayuri and the two agree to try one last time to save the future. She and Mayuri travelled back to the day Okabe tried to save Kurisu. After Mayuri sends her past self a text explaining that she cannot let Okabe give up, she and Suzuha are forced to leave before the past Suzuha and Okabe return. As the time machine runs out of power part-way through the jump, Suzuha and Mayuri are thrown into the distant past (18000 BC).

Eventually, Okabe of 2025 is able to complete the time machine and goes to 18000 BC to save them.

Steins;Gate
After Okabe finds his resolve and receives a D-Mail from his future self, they set up a new plan and return to the day of Kurisu's death and Okabe manages to save her by allowing himself to be stabbed. Before he falls, Suzuha grabs him and carries him back to the time machine so they can return to the present. Suzuha is not seen for the conclusion of the story, implying that she ceased to return in the Beta Attractor Fields.

Steins;Gate
Suzuha is briefly alluded to in the epilogue of Steins;Gate, with Okabe creating a Lab member pin for her, claiming that its owner will not exist for seven years.

OVA: Egoistic Poriomania
Okabe briefly encounters a woman who he mistakes for Suzuha.

Load Region of Déjà Vu
A version of Suzuha from the future occasionally appears, instructing Kurisu on what she needs to do to save Okabe. She later reveals that the Kurisu of the future created the time machine and sent her back in an attempt to save Okabe. She eventually takes Kurisu back in time to allow her to cement Okabe's existence on the worldline.

Robotics;Notes
After the events of Steins;Gate, in Robotics;Notes, it is revealed that Daru got married and has a daughter, who may be the Steins Gate Worldline's version of Suzuha. However, she does not appear during the events of Robotics;Notes.