I just know Nicky would unironically call borderline everyone Maus in German like if someone gets particularly nasty bruises or sprains from Exy he'd go "oh nein du arme Maus" or he'd look at pics of jerejean when they finally get together and go "aww guckt euch die beiden an, einfach Mäuse, die zwei" (he thinks the same about andrew and neil but wouldn't say it to their face because he values his skin in its unpunctured state thank you very much)