This is a special case among my wives. Eris is... Nuts. Like, a bit bonkers, unhinged, whatever you want to say. She's akin to a PG rated Joker in terms of insanity. What makes her PG is she does not harm anyone, ever, with her pranks and jokes. She very much adheres to my stance as a Trickster god; play jokes when you want, on who you want, and laugh with your victim. If they are upset, apologize to them sincerely, and take steps to make it up to them, say share a cookie. However, if the victim deserves to be knocked down a peg or three, or they have committed something unforgivable... THEN you can expect the Joker's standard cruel, twisted and lethal pranks. Thankfully, this is rare, and usually only happens when someone has really crossed me, and I don't think outright death is good enough. You need to be one special son of a bitch to want me to have Eris twist the damn knife...
That said... Eris has a more common and harmless focus to her nuttiness; she adores teasing my maids and especially my daughter, Syrus. To her, teasing my little Vulpix is the same way hugging someone and telling them "I love you" is to normal folks. She knows my daughter just gets cuter when she pouts or embarrassed, so Eris really likes to get her cheeks puffy so she can pinch them and coo about what an adorable sweetheart she is, even more so as she fangirls about all the ways she helped save the Multiverse... And myself, to an extent. Still, she does have the self control to stop once she's asked to. She just can't NOT love spending time with my family.