I hardly know anything about 相撲, so I was hoping someone else would butt in with a fun fact. Looking at Jisho this kani is actually usually read as ボク, and one of the words it appears in makes me shiver (not a fan of gory physical violence. I can’t rewatch movies like American History X and A Clockwork Orange. Sometimes the images still float up and make me cringe). So please no 撲殺 for me!
角
My first encounter with this kanji in the wild was a Japanese person on Twitter getting all enthusiastic about McD’s 三角チョコパイ - apparently that’s a thing they advertise, their chocolate pies are triangular! My mind is blown 
必
with it’s ひつ reading it denotes certainty and definiteness, although 必 on it’s own is archaic.
it’s かな reading is used with okurigana and when it is on it’s own, and it means “always, necessarily, without fail”
when 必 appears in word it is usually to do with something inevitable, something vital, or something that is required (mandatory).
斗
This is a ladle or dipper, though in Japan that meaning seems to have mostly morphed into a historical unit of volume.
It appears as a component in a few 常用漢字:
斗 appears in the name of the constellation 北斗 (Big Dipper), and in the name of the famous manga 北斗の拳 (Fist of the North Star).
Next:
万
The 旧字体 form of this is 萬. I am glad that I learned about these forms for numbers, because now I know what they mean on currency!
It is reasonable that since ten thousand is a very big number, this kanji frequently means many or all. Some descriptive words:
万年筆 a ten thousand brush – fountain pen!
万一 unlikely, one in ten thousand
万能all purpose, all powerful
万引き shoplifting
万歳
And here is a word I encounter more often than most: 万葉仮名 These are the characters once used as 当て字. They are not found much anywhere anymore except Buddhist texts.
Finally, in this time of the virus, we have 万物流転 all things in a state of flux.
流
Time to help this thread flow again!
The left part is the usual semantic 氵 representing water (水). According to Henshall/Seeley, the part on the right depicts a baby being born, with amniotic fluid flowing out. A bit more graphic than I was expecting!
This kanji appears in the 麻雀 (mahjong) term 流局, which in English is an exhaustive draw. This is when all of the tiles are used up without any player winning the hand. Players who were one tile away from winning receive points from those players who were not.
Here’s another kanji that can appear at the end of a mahjong hand:
満
I am so glad that I have been learning about the composition of kanji!
The semantic component of this is 水, and the phonetic is 㒼. 㒼 means to cover evenly and tightly, まん, a very rare kanji.
Wanikani says that if a tsunami hits these flowers they will both become full of water. A nice mnemonic.
Since I have 四字 on the 脳, I find that Jisho has 10 四字熟語 with this kanji.
満場一致 unanimity
満目荒涼 bleak and desolate
満面笑顔 smiling from ear to ear
満願成就 fulfillment of a vow, a prayer being answered
満身創痍 having wounds all over one’s body
満員御礼 all seats sold, as displayed on banners in the sumo hall
Looks like your brain forgot to nominate a new kanji, so I choose this one!
I mentally associate this kanji with 胸 (むね, chest), because both are body parts with 肉月 on the left, and 凶 as a component. However, the traditional form of 脳 is 腦, in which the メ shape is completely enclosed! So perhaps the shape was unified with 凶 during simplification.
WK teaches the vocab word 脳みそ, so here’s the next kanji:
味
I remember seeing this on food packaging when I was just starting to learn Japanese and spending a good ten minutes trying to look up what it meant. I think I remember feeling way more accomplished than I really should have for figuring it out, lol. I finally got to it on WK a few days ago, so now I shouldn’t have to look it up again.
図
This kanji is leading me on a detective chase all around the map of the ず.
Traditional form is 圖.
圖 is made of
囗 (walled city) + 啚 (stingy) (表外漢字)
啚 is an alternate form of another 表外字, 鄙.
鄙 means countrified. It is used in the word 辺鄙, countrified.
鄙 has it’s own weird history. It is originally composed of 外 + 人. It is frequently used is an example of 熟字訓, because it is still pronounced とひと.
Remember though, all of these are still kanji way off the 図表! Back when I was young, I would have had to go to the 図書館 to learn all of this stuff. In fact, I still have a 図書室 in my house!
In Chinese, 図 is just simplified to 图.
Sorry, @Zalathar, to leave you nothing last time!
熟