Ail

Two distinct looks define him. In his native alien shape his complexion is a pale green, his ears taper to elfin points, and a single earring hangs from the right one. Long hair in a soft blue carries pink threads through its longest strands, framing dark blue eyes, and a snug bodysuit in deep blue sheathes him from head to foot, mirroring An's own attire. Their coloring is deliberately swapped, since the streaks running through his hair match the shade of hers while her own highlights borrow his.

Disguised on Earth as Seijuro Ginga, he trades all of this for an ordinary fair complexion and a crop of orange hair that falls only as far as his neck. The purple-blue tint of his gaze and the earring on his right side are the two features he keeps.

A wandering eye colors much of his behavior. He flirts readily and drifts toward one woman after another, a habit that grates on An despite the bond the two share, and the tune he coaxes from his flute pulls admirers toward him without any effort on his part. Their attention rarely seems to trouble him.

Human customs puzzle him much as they do An, yet he proves the more curious of the pair about the way people live. When he grasps the idea of trading presents, a notion that cuts against his own upbringing, he still ends up handing one to An. A rivalrous streak surfaces around Mamoru, echoing the bickering between Usagi and An. His view of affection begins badly warped, since he assumes love is something taken by force, but he comes in time to see it as a shared and equal exchange and renews his connection with An on those terms.

Ail and An originate on a faraway world whose inhabitants drew their very existence from the Makai Tree. Greed eventually took hold as the population quarreled over it, and when the fighting ended the two of them were all that survived of their kind. The tree carried itself to Earth in the hope of teaching its remaining children to prize love above possession.

The pair arrive on the planet to siphon human energy on the tree's behalf. Ail slips into the guise of a schoolboy named Seijuro and enrolls at Juban Public Middle School, where he quietly develops feelings for Usagi while hiding them from An. His attention to other girls repeatedly stirs trouble: a shared meal with Makoto provokes a jealous An into attacking, which draws out the guardians and prompts the two to unleash the Cardian Utonberino. He sulks over being denied the role of Prince Charming in a Snow White production and disrupts it by loosing the Cardian Bipierrot, and later he sets out to drain Mamoru.

His change of heart arrives during the final confrontation. Shielding Usagi from the Makai Tree, he recognizes the wrongness of their campaign and becomes the first among them to truly grasp love after witnessing Sailor Moon's devotion to Mamoru. When An lashes out at the Moonlight Knight, the tree turns its branches on Ail and moves to impale him, only for An to absorb the blow and perish. The tree then reveals it was never malicious and had craved love energy all along. Once Sailor Moon restores it, the Tree of Life returns An to the living, and the reconciled couple depart with the Makai Tree to build a gentler life together.