It appears that Youkai are gaining the skills "Motivate (Charisma)" and "Exaggerate" from somewhere, I believe it to be the youkai summoner's traits somehow, but here is some evidence:
I don't want Youkai taunting me anymore Dev-Sama
A thing to add to this, they also have Play Cute if the summoner has the trait.
please don't ask why I know of this
It seems overall traits the user has are affecting youkais. My youkai was able to proc Ruled by emotions as well.
Unsure if they were memes as I have no Mechanation Summoners to test. But there was word of Youkai using Agile Accel as well. Will update this post if this turns out to be true.