yakkey, also known as SELTIVE, is a japanese internet illustrator specialized in Fan Arts, both safe and adult-only contents. yakkey made fan arts of titles such as Blazing Star, Xenoblade, Hyperdimension Neptunia, Kantai Collection and course, Triggerheart Exelica.
Almost all of his Triggerheart Exelica works are Crueltear-related, with the exception of a sketch of Exelica. He also worked with section S on the character design of Rayging Blue's Conflict Warred, including their Triggerheart-esque antagonist, Mother Maria.
During May of 2022, Yakkey closed down his website, as he considered it was no longer useful. However, his "Safe-For-Work" Triggerheart related artworks were posted and preserved for posterity on Wikiheart Exelica.