いろんなフォントで「riff」変換
Zen Old Minchoriff
Yusei Magicriff
M PLUS 1riff
Shippori Antiqueriff
Yuji Mairiff
Dela Gothic Oneriff
DotGothic16riff
Train Oneriff
Hira Minchoriff
Potta Oneriff
Reggae Oneriff
Stickriff
Zen Kurenaidoriff
Kosugi Maruriff
Rampart Oneriff
Hachi Maru Popriff
New Tegominriff
RocknRoll Oneriff
Kaisei Decolriff
「riff」をコピペできる装飾文字に変換（旧字体・丸囲みなど）
