「藤子不二雄」這個影響日本漫畫史深遠的筆名，實際上是由藤本弘與安孫子素雄兩人共同使用的創作組合。兩人自少年時期結識，攜手創作多年，留下無數經典作品。然而，到了1987年，這對傳奇搭檔正式宣布拆夥，背後原因並非外界想像的決裂，而是長期累積後的理性選擇。

首先，創作風格的明顯分歧是關鍵因素之一。藤本弘日後以「藤子·F·不二雄」之名活動，他始終堅持以孩童視角出發，擅長描寫溫柔純真的情感與富含想像力的科幻題材，《哆啦A夢》正是這種創作理念的集大成之作。相較之下，安孫子素雄的創作方向則逐漸轉向成人世界，他筆下的作品充滿黑色幽默、諷刺現實與人性陰暗面，例如《黑色推銷員》，風格明顯與藤本弘拉開距離。這種理念上的差異，讓兩人愈來愈難在同一筆名下自由發揮。

健康與現實層面的考量，也促成這次拆夥。1987年，藤本弘被診斷出罹患胃癌，使他開始正視生命有限的事實。同時，《哆啦A夢》所帶來的巨大商業價值與未來著作權、繼承問題，也成為必須提前處理的現實課題。為了避免日後產權歸屬產生糾紛，兩人決定正式分開筆名，各自獨立創作，這是一種為彼此、也為作品負責的成熟選擇。

安孫子素雄後來在回憶錄中提到，這次拆夥並非出於不和，而是在充分理解彼此心境後的分工。他曾感慨地表示，當時兩人都意識到「人生所剩的時間不多了，不如去做真正想做的作品」，正是這樣的想法，讓他們能在沒有怨懟的情況下結束長年的合作關係。

拆夥之後，筆名也正式區分。藤本弘將原本的「藤子不二雄Ⓕ」改為「藤子·F·不二雄」，而安孫子素雄則使用「藤子不二雄Ⓐ」繼續創作。雖然名義上分道揚鑣，但兩人之間的情誼始終未曾改變。

1996 年藤本弘辭世後，安孫子素雄公開表示，《哆啦A夢》是自己「一輩子都畫不出來的作品」。這句話不僅展現了他對老搭檔深厚的敬意，也道出了對藤子·F·不二雄創作靈魂的高度尊重。即使筆名拆分、創作道路不同，兩人共同締造的傳奇，依然在日本漫畫史上留下無可取代的位置。

Fujiko Fujio, the legendary manga duo consisting of Hiroshi Fujimoto and Motoo Abiko, officially ended their partnership in 1987. The separation was the result of several intertwined factors, most notably the gradual divergence in their creative directions. Hiroshi Fujimoto, later known as Fujiko F. Fujio, consistently favored an innocent, imaginative style rooted in science fiction and children’s literature, exemplified by works such as Doraemon. In contrast, Motoo Abiko, who later adopted the pen name Fujiko Fujio A, increasingly gravitated toward darker themes, black humor, and sharp satire of human nature, producing adult-oriented works such as The Laughing Salesman.

Health concerns and future rights management also played a critical role in their decision. In 1987, Fujimoto was diagnosed with stomach cancer, prompting serious reflection on the future. Given the enormous commercial success of Doraemon and the complexities surrounding copyright ownership and inheritance, the two agreed that separating their pen names would help prevent potential disputes over intellectual property in the future. This pragmatic consideration was not rooted in conflict, but rather in mutual respect and foresight.

According to Abiko’s later memoirs, the breakup was ultimately a mutual and understanding decision rather than a falling-out. He recalled that both men felt time was precious and believed it was better to devote their remaining years to creating the works they truly wished to pursue. This shared understanding allowed them to part ways professionally while maintaining a deep personal bond.

Following the separation, their pen names were formally divided. Hiroshi Fujimoto changed his name from Fujiko Fujio F to Fujiko F. Fujio, while Motoo Abiko adopted the name Fujiko Fujio A. Despite this division, their friendship endured unchanged. After Fujimoto’s passing in 1996, Abiko publicly expressed profound admiration for his longtime partner, stating that Doraemon was a work he could never create himself. This remark reflected not only humility, but also deep respect for Fujimoto’s unique creative spirit and artistic legacy.