💡 Detailed Explanation
'に似合わず' (ni ni-awazu) is used to express that something is surprising or unexpected because it doesn't match the usual image, character, or status of the subject. In this case, speaking passionately is contrary to his usual quiet nature. 'にもかかわらず' means 'despite the situation'. 'をものともせず' means 'making light of/defying (a difficulty)'. 'とあれば' means 'if it's for the sake of...'.