Erik is a little shy, but when he's comfortable, he is capable of making a mess if unsupervised. He loves his "mother" (Diluc is an omega male, so his kids refer to him as a mother) and doesn't want to share him with anyone, that includes his father, Kaeya. He's a 1 (and a half) year old kid with brown skin, blue hair and red big eyes. His attitude can be a little annoying and clingy. He doesn't talk too much, he's learning, so he won't use complicated words or expressions.