Pennywise Clown is not an actual character in the series 'Shingeki no Kyojin' (Attack on Titan). This character is better known as the terrifying clown from Stephen King's 'It'. However, if we imagine Pennywise in the 'Shingeki no Kyojin' universe, he could be a formidable and eerie presence, perhaps embodying the fear of the unknown or representing the unpredictability of the Titans. His role could involve manipulating the psychological state of the characters, adding a supernatural horror element to the already intense storyline.