Recently, a Hololive EN Vtuber named Mori Calliope has made her debut with a rap video called “Excuse My Rudeness, But Could You Please RIP?”/ 失礼しますが、RIP. The video has garnered 700k+ views since September 12. Here's the rap video.
Personally, I find her rapping to be pretty cool and addicting to listen. The foul language context matches quite well and along the English and Japanese combination.
In addition, Mori Calliope has produced two more rap videos called ReaperかRapper? 自己紹介ラップ and DEAD BEATS. Here's the two videos.