It's been that way since he was appointed as a 23-year-old to take over from the immensely popular Steve Price for the 2010 season.
It might not look like it at times, but Mannering enjoys captaincy.
"It's a huge honour," he said, "and you have to take the good with the bad. It's the same as a football player. It's a pretty cool way to make a living but it's not easy, especially when things aren't going well. It's bloody tough. But that's what makes the good times a lot better. I love the role and I'm very proud to do it for this club and group of people.
"You're going to cop the brunt of it [as captain] depending on how the team goes and that's how it is. [Criticism] is going to be there and there's no point listening to it or reading about it. If it ever meant I shouldn't be captain and it was best for the team, that's no skin off my nose. I just want what's best for the team."
The impact a captain makes in league is negligible and, even though he can be fingered for a poor run of results, Mannering takes little credit for the Warriors' midseason turnaround when they won seven from eight.
"That's not down to me or any other individual," he said. "It's down to the group working a lot better and working harder on the field for each other. It has to be a buy-in from the whole group."
It will have to be the case tomorrow night when the Warriors host the Raiders in a high-stakes game at Mt Smart Stadium. Both sides are struggling to make the top eight because of their inferior points differential but one team will definitely be out of the equation tomorrow.
"It's exciting," Mannering said. "The more important games are the most enjoyable. I don't think we need to try to invent anything new this week. It's a case of taking what we did last week [against the Titans] and doing it better."
The Warriors team to play Canberra at Mt Smart tomorrow, kickoff 5pm, is: Kevin Locke, Jerome Ropati, Dane Nielsen, Konrad Hurrell, Manu Vatuvei, Thomas Leuluai, Shaun Johnson, Sam Rapira, Nathan Friend, Suaia Matagi, Elijah Taylor, Simon Mannering (c), Todd Lowrie. Interchange: Ben Matulino, Jacob Lillyman, Feleti Mateo, Dominique Peyroux, Ngani Laumape (one to be omitted).
Canberra: Reece Robinson, Bill Tupou, Jarrod Croker, Joel Thompson, Sami Sauiluma, Terry Campese (c), Anthony Milford, David Shillington, Josh McCrone, Brett White, Josh Papalii, Joel Edwards, Paul Vaughan. Interchange: Glen Buttriss, Jake Foster, Dane Tilse, Tom Learoyd-Lahrs, Matt McIlwrick (one to be omitted).