Meryl Stryfe works as an insurance investigator for the Bernardelli Insurance Society alongside her junior partner Milly, tasked with looking into claims connected to Vash the Stampede. She's got a serious demeanor and a temper to match, though she's fundamentally a good person—just not someone you want to get on the wrong side of.
What's funny is that despite rarely throwing down in actual fights, she's packing an arsenal of derringer pistols hidden all over her coat. She's even joked about calling herself "Derringer Meryl" because of it. Her initial take on Vash is pretty dismissive—she pegs him as just another nuisance and definitely doesn't buy into the whole "legendary Humanoid Typhoon" thing. But as she spends time around him, her perspective shifts. She catches on that he's neither the villain people make him out to be nor the complete goofball he pretends to be. Over time, respect turns into something deeper; she genuinely falls for him.
The anime threw in a late-game hint that she might be a reincarnation of Rem Saverem, which is an interesting touch that doesn't actually show up in the manga and was probably the anime team's own creative call.
She's noticeably short—even more so in the manga. Early on in Trigun Maximum, she celebrates her 23rd birthday, meaning she started out around 21. There's also some implication that family stuff weighs on her, though it's never spelled out completely.
In Trigun Stampede, she's reimagined as a fresh reporter at Bernardelli News Agency hunting for her big break. She crosses paths with Vash while chasing a story and gets pulled into whatever chaos follows him. She comes from money and has a somewhat sheltered, naive quality to her character.
Content compiled by AnimeList.moe from publicly available sources.