Wikipedia:Articles for deletion/Ryōta Ōsaka
Easily meets  #1 with many significant roles in notable TV series.  Looking through his listed credits, I found 10 where he seems to be the main protagonist (Hamatora, Knights of Sidonia, Tsuritama, Rozen Maiden: Zurückspulen, Blood Lad, The Devil Is a Part-Timer!, Ace of Diamond, Brynhildr in the Darkness, Valvrave the Liberator, and OniAi), and I stopped looking after that so there may be more.  There were also many other roles where he played a major character other than the primary protagonist.  While the article certainly could use more sources, he is clearly notable
— User:Calathan, 01:08, 29 July 2014 (UTC)
Stance: keep
Cited policy: WP:NACTOR (Wikipedia:Notability)