I've actually done a bit of research on this topic myself and there are definitely some great options out there! One classic
undercut viking haircut is the "Ragnar" style, which is a long, slicked-back style with shaved sides. This can look really cool if you have a beard to match. Another option is the "Warrior Braid" style, which involves braiding your hair and adding metal or leather accents for a more rugged, warrior-like look. Just be aware that some of these styles require quite a bit of maintenance and upkeep to look their best.