Kanatan hasn't given context for this illustration though, so I have no idea why Yatsuhashi is pointing at Merlin like that – or why Lyrica, Lunasa, and Miyoi have that reaction. Certainly related to how his previous illustration featuring Benben and Raiko was flagged as sensitive by Twitter, but any other link is tenuous.
Ume Suishō is shredded shark cartilage and plum. Hiyashi Tomato is, well, just chilled tomato. Sashimi is raw fish. Gesoage is deep-fried squid tentacles. Hiyayakko is cold tofu. And edamame is boiled/steamed green soybeans.
And yeah, it seems there are different types to izakayas too, and "taishū" is the cheap and accessible kind.