Basic Trope: A power which seems weak at first glance, until you consider the creative applications of it.
Robed Ranger can make people deliriously happy with a touch: to the point where they can no-longer fight back.
Occulsion can turn invisible, but his real talent is that he can turn anything invisibe, which he can use to set up sneak attacks by his allies, seemingly pull tools or weapons out of nowhere, or just cause foes to run headfirst into a telephone pole they didn't know was there. There's also no way to know when he's using his powers, and he's not above abusing this fact for the sake of paranoia-inducing mind games.
Monkey Master has the power to telepathically control monkeys. This extends to apes, humans, and thus 80% of all earth’s superheros, not to mention any Killer Space Monkeys that come by. Then, to everyone’s surprise and especially Monkey Master, GOD is an ape and is promptly put under his mental dominion.
Thunder-dragoon has the power to control electromagnetism. Seeing as the four fundamental forces are controlled by such, he eventually becomes a Reality Warper.
Clara Chandelier's power of turning metal into glass is mildly awesome. She can break your gun, break your car, break your computer, break your robot, break out of prison... she can turn out the lights, or improvise a weapon... It still doesn't measure up to more normal special abilities, but creatively applied it has a variety of uses.
Occlusion can briefly turn invisible. This is surprisingly helpful in hand-to-hand combat, as it means the even if his opponent knos where he's standing, he doesn't know what attacks might need to be dodged, blocked, or countered, allowing Occlusion to land blows unimpeded.
Even if a power is useless, the required secondary powers behind it could be quite powerful.
The ecosystem where Monkey-master evolved had Big Creepy-Crawlies where most ecosystems would have vertebrates, and thus his ability to control monkeys is much more useful here than there.
Even if it's only a weak power, it may still be more than normal people can do.
A seemingly-useless power is easier to underestimate or dismiss entirely without taking the time to ponder the possible implications, and thus someone with that power has a good chance of being able to take an enemy by surprise once they figure out how to make it useful.
“Wait, he can make people happy? How’s that going to help him?” “Just keep watching and you'll see...”
Plotted A Good Waste: The main themes on the show revolve around creativity and imagination, and use of powers like this form it’s main foundation.
Played For Laughs: As it turns out, even without the ability to control humans and super-apes, Monkey-Master is feared worldwide... merely because monkey poop is nigh-impossible to wash out of a costume.
Played For Drama: Rainblast's power to change color really quickly makes him a walking seizure risk... To friend, foe, and innocent bystander alike. He seems weak because using his powers to their full effect runs the risk of massive collateral damage, and when he does cut loose, it's not pretty, and he's definitely not happy about it.