Character Relationship Map: Code Lyoko

Characters

• Jeremie Belpois / Odd della Robbia (played by Raphaëlle Lubansu) — protagonist

  Jeremie Belpois is an eighth-grade prodigy who discovers the supercomputer and coordinates the effort to protect Lyoko and bring Aelita into the real world. Odd della Robbia is his friend and a member...

• Yumi Ishiyama (played by Géraldine Frippiat) — protagonist

  Yumi Ishiyama is one of the three friends recruited by Jeremie Belpois to become a Lyoko Warrior. She is virtualized into Lyoko with the others, helps escort Aelita to Towers, and fights hostile progr...

• Ulrich Stern (played by Marie-Line Landerwijn) — supporting

  Ulrich Stern is a friend of Jeremie Belpois and a member of the Lyoko Warriors. He is repeatedly virtualized into Lyoko to protect Aelita, escort her to Towers, and oppose hostile programs. During the...

• Aelita Schaeffer (played by Sophie Landresse) — supporting

  Aelita Schaeffer is an artificially intelligent girl living on Lyoko and the central person the group works to protect. She deactivates Towers while the Lyoko Warriors defend her, is eventually materi...

• William Dunbar (played by Mathieu Moreau) — supporting

  William Dunbar is a fellow student at Kadic Academy who is invited to join the Lyoko Warriors as their sixth member. Soon after being virtualized, he is possessed and used as a weapon against the grou...

• Sissi Delmas (played by Carole Baillien) — minor

Canonical Relationships

Family, romantic, and professional connections based on plot evidence.

• Yumi Ishiyama → Ulrich Stern (Unresolved romantic attachment) — Yumi and Ulrich share strong mutual feelings, but hesitation, jealousy, and fear repeatedly prevent a stable romance.

  "Season 1 includes uncertainty over Yumi's letter, jealousy involving Emily, and repeated arguments about their feelings. Season 2 features jealousy i...

• Yumi Ishiyama → William Dunbar (Rejected interest and adversarial bond) — William's unreturned interest becomes a source of tension before turning into a dangerous personal confrontation on Lyoko.

  "William asks Yumi out in Season 2 and is rejected. In Season 3 he investigates her secret after rejection, and in Seasons 3 and 4 he repeatedly confr...

Story Dynamics

Alliances, conflicts, and narrative interactions that evolve throughout the story.

• Aelita Schaeffer → William Dunbar (Primary target and controlled opponent) — William is repeatedly used as the direct physical threat to Aelita, making their encounters central to the later conflict.

  "William repeatedly tries to throw Aelita into the Digital Sea after his control begins. Season 4 missions focus on protecting Aelita while recovering...

• Jeremie Belpois / Odd della Robbia → Ulrich Stern (Close friends and teammates) — Their friendship combines humor, rivalry, and dependable battlefield cooperation.

  "Odd and Ulrich repeatedly prank, train, compete, and fight together from Season 1 through Season 4. They also share responsibility for protecting the...

• Yumi Ishiyama → Aelita Schaeffer (Protective friends) — Yumi provides Aelita with calm protection and emotional steadiness during repeated threats to her identity and safety.

  "Yumi helps defend Aelita during early Lyoko missions, supports her when she is trapped or possessed, and later operates alone to protect the team whe...

• Ulrich Stern → William Dunbar (Romantic and combat rivals) — Ulrich views William as both a romantic rival and a recurring physical threat to the team.

  "William competes with Ulrich for Yumi's attention in Season 2. From Season 3 onward, Ulrich fights William repeatedly, including the Season 4 blade-t...

• Jeremie Belpois / Odd della Robbia → William Dunbar (Rescuer and controlled adversary) — Jeremie treats William as both a dangerous enemy asset and a teammate who must be recovered.

  "William learns the secret in Season 3 and is subsequently controlled on Lyoko. In Season 4, Jeremie repeatedly designs programs to free him while Wil...

• Jeremie Belpois / Odd della Robbia → Aelita Schaeffer (Protective teammates) — Odd acts as Aelita's energetic protector and field companion, while Aelita relies on his willingness to take risks for her.

  "Odd repeatedly accompanies or protects Aelita on Lyoko, including the first materialization attempt, Sector 5 missions, and later Replika operations....

• Jeremie Belpois / Odd della Robbia → Yumi Ishiyama (Trusted teammates) — Odd and Yumi combine his improvisational energy with her caution and tactical control.

  "Yumi rescues or protects Odd during early missions, while Odd joins her in repeated Lyoko operations and helps her during crises involving possession...

• Ulrich Stern → Aelita Schaeffer (Protective teammates) — Ulrich treats Aelita's safety as a central team responsibility and repeatedly places himself between her and immediate threats.

  "Ulrich helps defend Aelita during the Season 1 materialization crisis and repeatedly accompanies missions intended to protect her from capture in lat...

• Jeremie Belpois / Odd della Robbia → Sissi Delmas (Reluctant allies) — Sissi is an intrusive outsider whose occasional cooperation creates limited but meaningful contact with Jeremie.

  "Sissi investigates the group's secret in Season 1, later temporarily joins the group to help save her father in Season 2, and repeatedly comes close...

Story Analysis

The narrative follows a small team from the discovery of a virtual world to a widening war across Lyoko, the Digital Sea, and multiple replica systems. Its central threads are Aelita's identity, Jeremie's technical leadership, the team's emotional cohesion, and the effort to recover William.

Plot Progression

1. Season 1: The Hidden World — Jeremie discovers the Supercomputer and forms a team with Odd, Yumi, and Ulrich. The group protects Aelita from repeated attacks and finally brings her into the real world, only to learn that her surv...
2. Season 2: Keys and Memories — Aelita adjusts to life on Earth while the team explores Sector 5 and investigates Franz Hopper. The diary reveals that Aelita is central to the enemy's escape plan and that the apparent cure for her c...
3. Season 3: Collapse and Betrayal — The enemy attacks the core and destroys Lyoko's main sectors. William discovers the secret, is captured and controlled, and becomes a recurring danger while the surviving team struggles to preserve th...
4. Season 4: The Replica War — Jeremie and Aelita rebuild Lyoko and create upgraded equipment, including the Skidbladnir. The team explores replica sectors, destroys external Supercomputers, and repeatedly attempts to recover Willi...
5. Season 4: Endgame Pressure — The remaining replica systems become increasingly difficult to defeat, and the team develops a multi-agent countermeasure. The supplied context ends during the final confrontation, before its definiti...