The analysis of the demand-side of populism has grown in popularity over the last few years (e.g., Akkerman et al 2014, Elchardus and Spruyt 2016, Schultz et al 2018, Castanho Silva et al 2018, Kefford et al. 2021). An increasing number of comparative studies tries to measure the degree of populist beliefs and attitudes (such as, anti-elitism, people centrism, Manicheism, etc.) among voters and whether they serve to predict support for populist parties at a national level (Van Hauwaert and Van Kessel., 2018, Marcos-Marne 2020; Jungkunz et al., 2021). However, little attention has been paid to better understand to what extent these populist attitudes are intertwined with other psychological and to specific socio-political contextual features. Based on a three parallel surveys (N=1,000 each with more than 100 items) using a CAWI method in three Southern European countries: Greece, Italy, and Spain, this paper sheds light on the relationship between populist ideas (29 items from Akkerman et al. 2014 and Olivas Osuna et al. forthcoming), political activism, justification of violence (Belanger et al. 2019), conspiracy beliefs (Brotherton et al. 2013), collective narcissism (Zavala et al. 2009), national identity, attitudes towards institutions, national stereotypes immigration, and the European Union. Our results bear important implications for the discussion on the distinction between the left and right breeds of populism and for the literature on the integration vs demarcation profiles (e.g., Kriese et al. 2006; Gianfreda and Carlotti 2018). Finally, it help map the multi-layered and flexible othering process and the construction of an European "meta-us" (Olivas Osuna forthcoming)