There's this person who does both Nutaku and DMM Aigis content:
https://www.youtube.com/user/mizukizero1/playlists

If you're interested in DMM Aigis, these are the YouTubers I know so far:
Nasu - Detailed explanations that are very useful for beginners. Lafate uses his vids in his guides.
Greedy Lich - Mostly does low rarity challenges on event maps
atarimesan - Good guides for common units
SLOWLIFE - Another good Youtuber to go to if you only use common units; sometimes use premium units for the G event maps
yuki huziyama - A mix of premium and common unit videos
sennen war - Mostly G map videos with premium units