KIKIYAMA is the creator of Yume Nikki. Very little is known about them, due to insufficient information regarding their identity and location.
For a very long time, it was thought to the English community that KIKIYAMA had no form of contact, as the website hasn't been updated since 2008, and the only mention of KIKIYAMA in public was a likely-apocryphal interview said to be from a Japanese website. It was then discovered through a thread on Uboachan that KIKIYAMA's email address was available. A member contacted KIKIYAMA and asked whether or not the game would get an update, and it was claimed that Yume Nikki would make it past version 0.10, albeit very slowly.
More recently, a link was posted on Uboachan to a MySound profile, theorized by fans to have been created by KIKIYAMA. Link here. The account was however removed, as the host site went down a few years back. It can be accessed in part using the Wayback Machine (http://waybackmachine.org/).
It was claimed that KIKIYAMA was not involved in the 2011 off-the-Pacific-coast-of-Tohoku earthquake, but how this came to be known has not been confirmed.
To this day, KIKIYAMA remains a mystery and is not expected to ever be heard from again. Due to the long period of time since its last version release, Yume Nikki is likely not to be updated ever again.
KIKIYAMAHP is KIKIYAMA's official website pertaining to Yume Nikki. It can be found here:
- The changelog from KIKIYAMAs website has been translated by PsiWolf and can be viewed here: (http://psiwolf.tumblr.com/post/54058774964/yume-nikki-changelog-translated)