Rage Frenzy Berserk in Chinese / Japanese...

狂暴 is rage or the idea of going berserk in Chinese, Japanese Kanji, and old Korean Hanja.

暴怒 means violent rage or fury in Chinese.

This is not appropriate for custom calligraphy!

激怒 means violent rage, fury, to infuriate, enrage, exasperate, or indignation in Chinese, old Korean Hanja, and Japanese Kanji.

激怒 is not appropriate for custom calligraphy!

狂戰士 is the most popular way to write berserker in Chinese.

This title kind of means Norse warrior but often refers to the berserker in a fantasy role-playing game.
There is another way to write berserker in Chinese, which is 狂暴者.

狂暴者 is an alternate way to write berserker in Chinese.

This title often refers to the berserker in a fantasy role-playing game.

バーサーカー is how to write berserker in Japanese Katakana (phonetic Japanese).

Note: Because this title is entirely Japanese Katakana, it should be written by a Japanese calligrapher.

シグルイ is the name Shigurui as in the manga series “Death Frenzy” in Japanese Katakana.

Note: Because this title is entirely Japanese Katakana, it should be written by a Japanese calligrapher.

熱 means hot in Chinese, Japanese Kanji, and old Korean Hanja.

This can also be translated as: to warm up; to heat up; hot weather; fervent; fever; (high) temperature.

In some contexts, it can mean zeal, passion, enthusiasm, craze, or rage.