Ferocious Happo "Khelp Troop Leader"
Ferocious Happo is the first boss players encounter in Port Naori. His main abilities include Enrage and Summoning a Wave. While he is enraged (glowing red) it is easiest to just kite him around till he stops being enraged. The wave he summons hits pretty hard and it is fairly easy to just side step out of way before he has finished summoning it.