According to documents of the time, he was highly appreciated: it is written that he was 'considerate, courteous to everyone and really courageous' (the annual report of the Yasokai [Jesuit Society]), and that 'Nobutaka was wiser and braver than others, being also a son of the shogun' (the Tensho-ki [War Chronicle on the Tensho era]).
当時の資料によればその人物評は高く、「思慮あり、緒人に対して礼儀正しく、また大なる勇士である」（耶蘇会年報）「信孝もまた将軍の息男にして、智勇人に超えたり」（天正記）と記されている。