[Gensoku]

Капец, в википедии Бакумана написано, что образ Эйджи скорее всего взят с Кишимото

Спойлер:

Eiji's penchant and talent for mainstream, and the eventual serialization of his former assistants, Fukuda Shinta and Nakai Takuro, draw a comparison between him and Masashi Kishimoto, mangaka of Naruto. Also to note is that his preparation for the ending of Crow concurs with Kishimoto's supposedly final Fourth Shinobi War Arc in Naruto.
http://bakuman.wikia.com/wiki/Eiji_Niizuma

А вот Хирамару и правда вдохновлен автором Гинтамы))
http://bakuman.wikia.com/wiki/Kazuya_Hiramaru