Most Fencer players make this class because they love the concept. The Rapier fantasy is a rare one, with Granado Espada and ToS being the only games that heavily invested in the concept, trying (and I repeat, trying) to adapt realistic fencing moves and timing logic, so we could say they gathered here.
Fencer is what people said above, a single target and duelist specialist.
It is the only class that can pretty much negate physical damage without defense gear investment, Flanconnade is pretty much 100% block for half second per charge (there is 5), preparation activates block during its channel and buffs it for 55%~75%, all without the need of a shield.
And if we ever again have dodge as a relevant stat, Lunge and Esquive Toucher are the biggest evasion buffers of the game (though it only lasts for a second or so).
If only Fencer could block magic as well…
EDIT: I don’t know if you get it yet, but I love Fencing. I mean, ■■■■■■■ love it to the core, like a fanboy.