This comedic anime series about an ex-yakuza househusband could be a really fun way for you to learn stereotypical yakuza speech style and vocabulary!
The main character, Tatsu, used to be called "Immortal Dragon" when he was a legendary yakuza. Now he's a dedicated househusband, taking care of the house chores and supporting his wife's career, and he is great at it! He even makes an elaborate キャラ 弁 (short for "character bento") for his wife, makes sure to collect loyalty points from stores, and goes to cooking classes and yoga classes.
Tatsu speaks in Kansai dialect and he uses a stereotypcial yakuza speech style. What's funny about this show is how he still uses yakuza jargons and on top of his intimidating look, it throws off people who he meets in daily life. For example, he often refers to a thing as ブツ, which is a slang for "substance" which implies something sketchy, like illegal drugs. He also uses シマ, a yakuza term for "turf" to mean his family and such.
While he still keeps those yakuza elements, he has a cute and heartwarming side as a househusband. Seeing these mismatching sides of his personality and looks (such as how he often wears an cute apron on top of his yakuza suit) is absolutely funny to watch. The show is not fully animated, and it's mostly slideshow-based, but the voice actors do an excellent job of making it feel dynamic and lively.