Near the Halloween of Yip 0, Neil_Boekend brought something new to the OTT: brainslugs safety hats. They quickly spread through OTThers' avatars, soon leading to an archival request and attempt by mrob(emphasis mine):
BTW, it would be nice if everyone could save their avatars so they can eventually be put in the wiki. We got most of those created by OTTers who were posting during the mid-600's, but surely missed a few. For example, we got five of the recent variations by @AluisioASG.
This page is an up-to-date (unlike the last post I linked to) index of all avatars I've used in the OTT, in order of first use. I do not keep a record of when they were used or reused of how long I stuck with them.