Ryouga provoking Sailor Moon into attacking him, then redirecting her moon tiara to kill a youma.
Happosai. Incredibly perverted. Unreliable in the extreme. Hated by most of the cast for being... himself. Single handedly turns the tide against the youma army... until the generals show up, of course. Doubles as a crowning funny moment.
When the Darkmistress confronts her late in the first story, Beneda is at first panicking and thinking that there wasn't any sane hope of victory. Then she remembers the host of people she's wound up with, and that no-win situations barely slowed them down... and realizes that she's beginning to think the same as they do. She accepts her insanity with a laugh and attacks the Darkmistress without further hesitation, cementing her place as one of the Wrecking Crew.
From The Dark Lords Strike Back:
Herb and Loofah piercing through every single one of Queen Beryl's shields and shredding her lungs. This has the added effect of giving Beryl a genuine fear of Herb afterwards, as she'd needed to use the bulk of her magic to heal herself from that attack. The thought of facing him again without Metallia's backing was enough to make her shudder.