The Tokamak à Configuration Variable (TCV) is equipped with an advanced set of diagnostics dedicated to studying non-thermal electrons. Among these, the Vertical Electron Cyclotron Emission (VECE) diagnostic [1] is capable of measuring ECE at various frequencies along vertical lines of sight, in principle allowing for a one-to-one mapping between the measured electron energy and the particle frequency. However, reconstructing the 3D electron distribution function from ECE measurements presents an ill-conditioned problem due to harmonic overlap and thermal noise. A more robust technique involves the use of a synthetic ECE diagnostic that provides simulations of non-thermal electron emission directly comparable to measurements. In this contribution, we introduce a new general synthetic ECE diagnostic that accounts for the effects of suprathermal electrons: the YODA code. This code is capable of calculating the emission and (re)absorption based on any numerical electron distribution function calculated with kinetic codes (such as the 3-D bounce-averaged relativistic Fokker-Planck code LUKE [2]) for an arbitrary line of sight, simulated using the C3PO [3] ray-tracing code. YODA has been validated for thermal plasmas against the ECE synthetic diagnostic SPECE [4]. Additionally, its direct application to TCV electron cyclotron current drive (ECCD) and runaway electron experiments shows good agreement between experimental VECE measurements and synthetic intensity trends. In order for our simulations to match measurements, we must include an electron transport operator which suggests that the nature of the transport of suprathermal particles is an energy-dependent phenomenon, in line with recent insights suggested in the literature [5]. [1] A. Tema Biwole et al, Rev. Sci. Instrum. 94 103504 (2023) [2] J. Decker and Y. Peysson, EUR-CEA-FC-1736, Euratom-CEA (2004) [3] Y. Peysson et al, Plasma. Phys. Control. Fusion 54 045003 (2012) [4] D. Farina et al, AIP Conf. Proc. 988, 128–131 (2008) [5] J.A. Cazabonne et al, Plasma. Phys. Control. Fusion 65 104001 (2023)