Tite Kubo
Prior to being serially published, Tite Kubo wrote and illustrated several one-shot manga. Three of these were later published in English, included in Viz Media's collected volumes of "Zombiepowder." These short manga display the rapid development of Kubo's artstyle in the mid-90s. Afterwards, Kubo published another one-shot after "Bleach" ended, with an artstyle that has been widely recognized as his own.