All People
Everybody
noun
If we're talking about ten thousand persons, then we might as well be talking about all people and everybody, because that's a lot of people, you know?
This is a jukugo word, which usually means on'yomi readings from the kanji. Since 万 and 人 both have two on'yomi readings, here's a mnemonic to help you remember which ones to use:
All people have been banned from Nintendo (ばんにん). Apparently they're working on something super secret, so now everybody is banned. What could it be?!
この俳優は、万人に人気がある。
This actor is popular with everyone.
やっぱり万人受けするデザインにする方がいいんじゃない？
In any case, wouldn't it be better to go with a design that appeals to everyone?
これは万人に共通の感想だろう。
This seems to be the common impression among everyone.