I know someone who augmented his English study by spending more time on the bus than necessary and sitting near old ladies who were chatting amongst each other. They tend to speak slower and with more clarity. Tactics like these really helped him master his English accent. This was back in the 1980s.
My Japanese improved significantly by reading the Crayon Shin-chan comics. The advantage of comics aimed at young people is that they have phonetic characters (hiragana) written above the Chinese characters (kanji), so you don't have to deal with the hell of written Japanese (early Christian missionaries described Japanese as being a language "from the devil", and I am sure they were referring to the written version).
I don't know what that is but according to wikipedia[1] Anpanman has a higher total revenue than MCU, Harry Potter, Transformers, Spiderman, Barbie, etc
It's insane that the only one I don't recognize is so high up on the list
When you happen to be around parents interacting with their toddler age children, you almost can't not learn the language. Only on toddler level, but that can't be the worst start.
When I studied Japanese, watching kid shows was really helpful for ear training with a more simplistic vocabulary.
My preferred weird kid's show for that was Anpanman. Hahihuhehooooo~!