Comparison between observations and models. Top panel: bolometric LCs. Bottom panel: photospheric and line velocities evolution. Time is shown in days since maximum bolometric luminosity. The solid red line represents our preferred model for SN 2023pel, associated with the lowest χ², driven by a magnetar with P = 3.2 ms, B = 28 × 10¹⁴ G, and M_Ni = 0.24 M_⊙ (see Sect. 4 for more parameter details). The dashed blue line represents the Ni model, with M_Ni = 0.9 M_⊙. Solid green and gray lines represent models for SN 2011kl calculated by Bersten et al. (2016) and Moriya et al. (2020), respectively. The shaded area denotes the weighted average velocities of SLSNe Ic (pink) calculated by Liu et al. (2017). Observations of SN 1998bw (Clocchiatti et al. 2011) and SN 2011kl (Greiner et al. 2015) are included for comparison.