Star-forming galaxy main sequence diagram, stellar mass vs. SFR, comparing hosts of FXTs and various other transient classes (one per panel) such as SNe type Ia, Ib, Ic, II (Tsvetkov & Bartunov 1993; Galbany et al. 2014; Schulze et al. 2021), super-luminous SNe (SL-SNe; Schulze et al. 2021), LGRBs (including SN 2020bvc; Chang et al. 2015; Li et al. 2016; Izzo et al. 2020; Ho et al. 2020), low-luminosity LGRBs (LL-LGRBs; GRB 980425, GRB 020903, GRB 030329, GRB 031203, GRB 050826, GRB 060218, and GRB 171205A; Christensen et al. 2008; Michałowski et al. 2014; Levesque 2014; Krühler et al. 2017; Wiersema et al. 2007; Wang et al. 2018; Arabsalmani et al. 2019), SGRBs (including GW 170817 or GRB 170817A; Li et al. 2016; Im et al. 2017; Nugent et al. 2022), TDEs (French et al. 2020), and Paper I FXT candidates (nearby and distant FXTs). Grayscale contours denote the SDSS galaxy distribution from Brinchmann et al. (2004). The solid cyan lines show the best-fit local galaxy main sequence relation from Peng et al. (2010), while the dashed colored lines denote the upward evolution of the boundary separating star-forming and quiescent galaxies as a function of redshift (at z = 0.0, 0.1, 0.2, 0.3, and 0.4; Moustakas et al. 2013).