You can add 'ón' to the end of some Spanish nouns to add intensity, but I'm not sure you should in the case of a demonym. I would just say 'muy' or 'verdadero', in addition to the noun, or add an adverbial phrase like 'de hecho' or 'de veras'.
'Soft' (suave, in Spanish) is an adjective and can be modified with an intensifier. A 'tome' (tomo, in Spanish), on the other hand, is a noun that should not be modified with an intensifier.
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