Well I was going to say Yeti just from the look, but thinking about it more analytically. Sirentist looks angry and Yeti looks scared. So if you are scared someone had to scare you-right? So my vote then goes to Sirentist. How about we call it a tie?
Seriously, all of you voting for Yeti. First of all, Yeti totally cheated by going through his saved looks and choosing his scariest get-up. Second, just look at the scariest thing he could come up with. If you vote for Yeti you are voting for a kewt widdle cheaty-pants puddy tat wif sticky-uppy earses.
Team Sirentist all the way. There's nothing like a Sirentist scorned. The reason why we can never find Bruce is cause Sirentist killed him and put him in an SDB. This is what Roboyeti looked like 2 mins after the above smackdown occured: lem.to/p/ieTI
The woodland sirentist avoids confrontation at all times, often preferring a solitary existence. However, when cornered, this startling grimace is the last thing you will see....ever ...
Sirentist wins. Labcoat and purple hair and fangs and scowl spell DOOM vis a vis Dr. Jekyll n Mr Hyde. It looks like Yeti has consumed polyjuice potion here. Based on her regular look, Yeti aint scary. Yeti cuddly and huggly.
View all of RoboYeti's snaps
Yeti.
Sirentist always looks that way, we are already used to it. ;p
(but then again I do know the Yeti's secret tickle spot ;)
Me? I am naturally scary.
And Siren...