Edge plasma behavior plays a central role in determining the overall confinement and operational limits of tokamak plasmas. In particular, turbulence at the plasma boundary strongly influences particle and heat transport and remains a key target for performance optimization. Among the shaping strategies currently explored, negative triangularity (NT) operation has emerged as a viable alternative to conventional positive triangularity (PT) plasmas, having demonstrated improved confinement, reduced turbulence-driven transport, and the absence of edge-localized modes, thereby alleviating plasma–wall interaction constraints. In this paper, experimental observations from the upgraded thermal helium beam (THB) diagnostic on the TCV tokamak are reported. The analysis is based on a large database of discharges, selected using plasma triangularity as the sole discriminant. These measurements are used to investigate how plasma geometry affects edge temperature () and density () profiles, and fluctuation properties. A comparative analysis between PT and NT plasmas is carried out, with emphasis on the modification of edge turbulence characteristics. The results reveal systematic differences between NT and PT plasmas, with NT discharges generally exhibiting lower turbulence levels in the scrape-off-layer (SOL), indicative of a modified edge transport regime. These findings are enabled by the ability of the THB diagnostic to access both kinetic quantities and fluctuation amplitudes from the plasma edge to the SOL, providing new insight into turbulence suppression mechanisms associated with NT shaping.