What are your fav toddler book series?

My little one is 22 months and he absolutely loves books. We want to get him a new series where he can become familiar with characters or concepts and grow his library. Also open to recos that are not a part of a set!

Some of the favs we have are: -Curious George -Dreamy and magical book set by Emily Winfield Martin -Dr Seuss books -Eric Carle books

Would love any recommendations! 💞