Fredrik Martinsson joined Ultimate Central in December of 2004 under the name Ultimate Warrior. This was changed by the administrator E in February of 2008, when UW requested to post under his own name instead of an alias.
He is not one of the most frequent posters, but his contributions to the site's quality have been above that of the average poster.

His first notable contribution to the site was a thread where weekly links to previews of comics from different sites where posted. However the active interest was not good and only a few members posted responses in the thread. This lead to the thread being abandoned and un-stickied.

After that the focus point was posting news about Ultimate comics, but after the majority of the site members lost interest in the universe that had drawn them to UC in the first place, the site's priority changed and Ultimate news was no longer prioritized above any other comic news.

The current contributions to the site from Fredrik Martinsson consists of posting the monthly comic solicitations, a weekly comic shipping list and the comic shipping update list.

Aside from the above contributions, he also possess a great knowledge of computers and helps other members with their computer problems when he can.