Olli Herman Kosunen (born 19 May 1983), also known as H. Olliver Twisted, is a Finnish singer who has played in the Swedish glam metal band Crashdïet.

In 2007 he joined the Swedish hard rock band Crashdïet, to replace their former singer Dave Lepard; who died in January of the previous year.

Twisted released one album with Crashdïet, The Unattractive Revolution, which featured the singles; "In the Raw" and "Falling Rain".

On 13 July 2008, Twisted left Crashdïet so he could spend more time in his other band, Reckless Love.

[1] Furthermore, Herman and Noora are the main characters in the Reckless Love music video "Animal Attraction".