Jonathan

Jonathan ( Jonasan) is a Shinigami, who became Izumi Lio's new partner. In the manga, he is really Sheldan ( Sherudan-buchō), who is the head of the Death Pediatrics Ward.

Manga
As Jonathan:
 * In the Middle of a Hollow Sea
 * "Madoka's" Standards
 * The One I Earnestly Love Is You
 * The Never-Ending Feast of Life
 * If There Is Still Time
 * Love and Loneliness
 * The Forbidden Hide and Seek
 * My Secret Blooming Love for You
 * Forcing Herself to Face Forward
 * You Are Calling for Me Too, So...
 * Taiyaki, Contrariness, and Meroko
 * Pure Antithesis 100%
 * You Can See the Drops of Reminiscence in the Rain
 * Pure Love, Songs of Love
 * Absolute Territory—Midnight Revolution
 * Not Even God Can Stop the Moon
 * Yami-Nabe Love-Love Project (side story)
 * If the Little Mermaid Is You
 * Rabbit in the Moonlit Night, Dreams and Tears
 * To My One and Only Eichi

As Sheldan:
 * If There Is Still Time
 * A Kiss for Meroko (side story)
 * Please Call My Name When I Get Lost at the Railroad Crossing
 * Pure Love, Songs of Love
 * The One Who Loves You
 * Sugarless Milk Chocolate
 * Rabbit in the Moonlit Night, Dreams and Tears
 * Full Moon o Sagashite
 * If My Wishes Will Never Come True, I Will...
 * To My One and Only Eichi

Anime

 * The New Death Spirits, Izumi and Jonathan
 * The Gentleman On the Swing
 * An E-mail from Eichi?
 * The Best New Singer Award
 * A Present from Full Moon
 * I Can't Sing Ever Again
 * She Can't Turn Into Full Moon!?
 * Mitsuki's Feelings—Meroko's Feelings
 * I Just Can't Tell Him
 * Day of Destiny
 * Searching For The Full Moon

Trivia

 * In an author's freetalk in the manga, Tanemura mentions that one day at work, she drew a picture of what she thought Peeves from Harry Potter looked like. She showed it to her assistants, who laughed and said it did not look anything like Peeves. Tanemura decided not to waste it, and used the sketch as the design of Jonathan in ghost form.
 * Izumi and Jonathan knew all along that Takuto and Meroko were using their powers to help Mitsuki. However, they won't say anything to the chief.