Title of the image on Pixiv is "三笠 赤男 (ミカサ・アッカーマン)".
The pun is unconventional but clever. The artist has put kanji to her name:
三 = 'mi' (three)
笠 = 'kasa' ('bamboo hat')
赤 = 'aka' (red)
男 = 'otoko' (man)Dual-language puns are the best.