The four bosses are Shuten-dōji, Ibaraki-dōji, Hoshigumi-dōji and Ibuki-dōji.
Damn Wikipedia. Damn the Touhou wiki too, that didn't help me either.
Hmm?About the Big Four, who were the other members besides you and Yuugi?Hey, Suika.Oh?Well...It's faster if you look at this.It's a picture of everyone back in the old days.
Here.Eh? Lemme see.You heard it pretty well, didn't you?Like...There's a lot of fighting spirit in this.
Who's the big guy?