User blog:Cdcat/A question about contacting other uses?

Recently I looked into using other peoples articles for my own characters and although I have contacted the uses through their talk pages I've reasoned belief that the users in question, LyreOfOrpheHyus, KawaiiTitan, have more or less left the wiki as neither has been active on the site for over a year. I am new to this site and Wikia in general and I am unsure about the etiquette surrounding this matter. What other means of communication would be appropriate to try and get their permission for use of their articles?