One of my crazy thinkings back in 2011 was to create a character which had some resemblance to Lain, from the “Serial Experiments Lain” anime. The joke is in the ending of each chapter, coinciding of Haiku as the “To Be Continued” of BeOS under the support of a community.
Of course it only happens in my mind. 
But, to get back to the topic, last year contest’s demographics were from 12 to 21 year olds. Using this prompt was intended to revive Haiku’s presence among computer and art enthusiasts.
In any case, I can see the community is satisfied with no mascot.