Many hoomans fell for Mumei due in part to the scuff in her early streams, and a big part of the experience was watching her grow and improve over time.
Here's a list of the most recommended streams to watch in order to fully appreciate the evolution of Mumei:
Solo - Gaming
Constructor simulator 2016
Passpartout series
Part 1 - https://youtu.be/jBpUdH6eVk0
Part 2 - https://youtu.be/X9bQpWFjxlQ
Part 3 - https://youtu.be/m42h-F5zhng
The Legend of Zelda : Breath of the Wild
Most recommended would be the Zora's Domain
https://www.youtube.com/watch?v=FqqgW4Iw2qc
Big Brain Academy
https://www.youtube.com/watch?v=-vDc_AtM7bk
Minecraft : berry lovers only
https://www.youtube.com/watch?v=pTmR-A7NXbY
The longest stream at the current time. Described as possibly one of the most entertaining MC stream from Mumei's POV in multiple aspects and most particularly interactions with Sana and Kronii. Slow second half, but still worth the watch.
Solo - Variety
Karaokes
See the 'Various pieces of media' pastebin
The Peacock drawing
ASMR - Study with me?
'I went to the dentist' Zatsudan
Collabs
HoloCouncil Meeting : Are you dumber than a 5th Grader?
HoloCouncil Meeting : Jackbox Party Games (second game - Murder Trivia Party - on Fauna's channel)
https://youtu.be/3Tn2XhYMWpw?t=2224
We Were Here Together (on Kronii's channel)
https://youtu.be/IlLbvqyH_Zk
Most recommended would be to watch the second half.
Minecraft JP Tour with Kronii
MadLibs Theatre (with Bae)
Mario Party Superstars (on Kiara's channel)
Dead by Daylight (killer run)
https://youtu.be/UDl7mNlikAU?t=5519
Devour (with Gura, Kronii & Fauna)
A Way Out (with Bae)
Part 1 - https://youtu.be/7mbweI-dp5g
Part 2 (on Baelz's channel) - https://youtu.be/iKJbDwcDGK8