Je t'aime (alternately known as Jutaime or Jutem) functions as the mechanical combat partner (B't) of Fou Lafine within the Machine Empire. Her design draws directly from the Chinese mythological Vermilion bird of the South, embodying the phoenix (hō-ō bird), which dictates her core attributes and visual identity.

After suffering fatal damage from the antagonist Quattro, Fou Lafine resurrects her by performing the "song of the angels" on his violin. This act unlocks her latent resurrection ability, transforming her into a "true phoenix" form. In this ascended state, her original vermilion hue shifts to emit a distinct pinkish glow, reflecting heightened power and purity.

As an independent combatant, Je t'aime actively pursues and engages adversaries like members of Crow solo. Her signature offensive technique, "Deadly Carol," projects sonic waves that overwhelm a target B't's control system. This induces hallucinations of angels and skeletons, culminating in mental collapse. Targets evade it by deactivating auditory sensors, though it poses no risk to humans. Synchronizing with Fou's violin performance amplifies this ability into "Fortune Symphonic," forging psychological and emotional bonds with those within range. Her resurrection remains passive, demanding external activation—specifically Fou's music—to trigger rebirth into the true phoenix state.

Throughout the *B't X Neo* OVA sequel, her narrative centers on Fou Lafine's conflicts, particularly against Quattro. A pivotal arc involves her destruction by Quattro and subsequent revival, reinforcing her themes of renewal and dependence on Fou for transformation. The storyline does not explore significant evolution or functional changes beyond this resurrection and her amplified combat role.

Her French name translates to "I love you," and she is consistently portrayed with feminine pronouns and vocal traits. No additional background on her creation, relationships beyond Fou, or appearances in spin-offs or alternate media is documented.