Both players have recently been involved in tests for the Kumuls side against the England Knights and the Australian Prime Minister's XIII.
Brawa (27-years-old) is a highly respected member of the PNG Hunters side and was named the club's Players' Player of the Year at their 2018 awards night.
The lock forward is a strong leader on and off the field, and plays with a high level of toughness and determination.
Brawa gets through a mountain of work in the middle, averaging 115 run metres and 37 tackles per game and featured regularly in the QRL Media 'Team of the Week' throughout season 2018.
Excitement machine Gebbie (23-years-old) made a lot of noise in his debut season in the Intrust Super Cup and collected the Hunters' Rookie of the Year award for his efforts.
The fullback / winger is electric with the ball in hand, scoring 10 tries on the season and averaging 126 run metres per game.
Seagulls CEO Hanan Laban said the pair would make a big contribution to the club in 2019.
"We are very excited to bring two high quality players in Rahdly and Edene to the Seagulls – both have proven records in the Intrust Super Cup and are test players for their country.
"In Rahdly, you have a player who plays above his weight, and with plenty of heart every week. He is tenacious in attack and defence, and we believe he will bring a lot of positive energy to our side.
"Edene is one of the best athletes in the competition who possesses speed and lethal finishing ability. He has the potential to take his game to another level at Wynnum Manly.
"It is a great opportunity for both Rahdly and Edene to come to Australia to further their careers. We look forward to working with both players and helping them achieve their dreams in rugby league."
>> View other Wynnum Manly 2019 signings.
*This article first appeared on Wynnum Manly Seagulls website.