So you are saying that anonymous internet users like me are "trustworthy" than Wikipedia. Well, the part that Wikipedia is not trustworthy is indeed correct.
If you are doing some serious research, you may want to contact Theatre Echo, the theatre company Yamada belonged to. From top, fill in your name, email address, and your question, then press the blue icon to send it.
https://t-echo.co.jp/?page_id=4171If it's just for homework, ask at your local library. The library is there to help young students, and if you don't ask them for help they won't know how to help, and sooner or later they will become a useless establishment.
You also could have asked us at the beginning, "I want to do some research on the late Yasuo Yamada. He was best known for his voice work as Lupin Sansei, and as the Japanese voice of Clint Eastwood. I am not a native Japanese speaker. There is a few English resources, such as Wiki articles, but it is difficult to know how trustworthy they are. Could someone help me find further information that might not be available in English? Here are the things I need to know......"
Meanwhile, here is what I can say:
1. Is it true he taught at Waseda University?I couldn't find any info about that in Japanese, but he was a student there for a while, and I wouldn't be surprised if he did a lecture or a day or two there after he became famous. This is the official site for Waseda, and you can chose English:
https://www.waseda.jp/top/2. What was his career beyond Lupin and Clint Eastwood?The following database has a reputation for being quite trustworthy. (Again, it's up to you to trust
me.) When you click titles you can jump to a different page that show the English titles of each work. From there you can also jump to IMDB.
http://www.allcinema.net/prog/show_p.php?num_p=126303&ct=It is true that Yamada also made many real-life appearances on TV, theatre and movies, as you can see from Japanese Wikipedia. Particularly since the late 70s, he even had a lot of exposure as things like TV quiz show guests, which I often enjoyed at the time as a viewer. (Again, it's up to you to trust
me.)
3. What was the man like? How did his peers and the public receive him?How about hiring someone to translate Japanese Wiki and quote it if necessary. You can never define how a man was "received" unless you actually know him. You can only say that "he was said to be received this and that way, according to this source".
But as part of the Japanese "public" I can say that Yamada was considered handsome and funny enough to not be a letdown to Eastwood/Belmondo/Lupin fans.
4. Did Yamada actually will Kanichi Kurita to take over after his passing?I didn't even know it was rumoured.
5. Are there any little known facts or trivia about Yamada?I reckon that this is not meant for a "yes or no" answer.