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In this work, we analyse the density profiles of subhaloes with masses$M_\mathrm{sh} \geq 1.4 \times 10^8$ M$_\odot$ in the TNG50 simulation, withthe aim of including baryonic effects. We evaluate the performance offrequently used models, such as the standard NFW, the Einasto, and a smoothlytruncated version of the NFW profile. We find that these models do not performwell for the majority of subhaloes, with the NFW profile giving the worst fitin most cases. This is primarily due to mismatches in the inner and outerlogarithmic slopes, which are significantly steeper for a large number ofsubhaloes in the presence of baryons. To address this issue, we propose newthree-parameter models and show that they significantly improve the goodness offit independently of the subhalo's specific properties. Our best-performingmodel is a modified version of the NFW profile with an inner log-slope of -2and a variable truncation that is sharper and steeper than the slope transitionin the standard NFW profile. Additionally, we investigate how both theparameter values of the best density profile model and the average densityprofiles vary with subhalo mass, $V_\mathrm{max}$, distance from the host halocentre, baryon content and infall time, and we also present explicit scalingrelations for the mean parameters of the individual profiles. The newlyproposed fit and the scaling relations are useful to predict the properties ofrealistic subhaloes in the mass range $10^8$ M$_\odot$ $\leq M_\mathrm{sh}\leq$ $10^{13}$ M$_\odot$ that can be influenced by the presence of baryons.

Not All Subhaloes Are Created Equal: Modelling the Diversity of Subhalo Density Profiles in TNG50