Yumoto Hakone, a first-year high school student, sports thick, fluffy blonde hair and warm reddish-brown eyes. His modified uniform pairs black pants and an open blazer with a white shirt, accentuated by a light blue sailor scarf. Radiating bubbly innocence and an endearing lack of common sense, he reacts to bizarre occurrences—like meeting a talking wombat—with unshakable calm. This cuddle-driven teen relentlessly attempts to hug the very alien wombat that gifts him supernatural powers.

As Battle Lover Scarlet, he activates his transformation by kissing the "Lovracelet" and exclaiming "Love Making!", summoning ornate battle attire: a prince-inspired crimson-trimmed tunic, heart-adorned boots, and luminous gloves. Embodying light, he wields the Love Stick "Lumiere of Love" to launch attacks like Scarlet Lumiere and Love Sprinkle, purifying foes with bursts of radiant energy.

His life is anchored by his devotion to older brother Gora, whose abduction drives Yumoto to desperate action. He also develops an earnest bond with third-year En Yufuin, whom he reverently addresses as "senpai," their mutual reliance shining during crises.

Story arcs reveal his growth: he shatters a monster's age-reversing illusion through sheer sincerity and mediates clashing teammates through spirited volleyball matches. When seniors graduate in the OVA arc, he shoulders the Defense Club’s legacy with undaunted zeal.

His triumphant catchphrase, "Love is over!", prompts playful groans from comrades, highlighting his relentless optimism. Though occasionally naive, his unconventional tactics repeatedly outmaneuver negativity-fueled adversaries, proving earnestness a formidable weapon.