According to Roger and Garp, Imu is "a dark monster".
So now it's confirmed, Imu is not a sillhouette, that's just how he looks like.
https://en.wikipedia.org/wiki/Shadow_person
"A shadow person (also known as a shadow figure or black mass) is a popular subject in circles of the paranormal and supernatural detailing beings resembling animate human shadows, sometimes interpreted as the presence of a spirit."
And with this, I want to mention something I brought up before again, when looking at the shadow people wikipedia page, there is a particular shadow person some people experience, named the Hat man
"One example of a particular shadow person is the "Hat Man", who shares the characteristics of general shadow people but is named for a fedora or other brimmed hat on his head. Descriptions of the Hat Man date back to as early as the late 2000s.[12] The Hat Man is commonly associated with sleep paralysis and the abuse of the antihistamine medicine diphenhydramine, commonly sold under the brand name Benadryl.[12] He is typically described as having very few or no discernible features, although some witnesses have claimed they can "feel him staring" at them."
Which could have to do with the strawhat
So now it's confirmed, Imu is not a sillhouette, that's just how he looks like.
https://en.wikipedia.org/wiki/Shadow_person
"A shadow person (also known as a shadow figure or black mass) is a popular subject in circles of the paranormal and supernatural detailing beings resembling animate human shadows, sometimes interpreted as the presence of a spirit."
And with this, I want to mention something I brought up before again, when looking at the shadow people wikipedia page, there is a particular shadow person some people experience, named the Hat man
"One example of a particular shadow person is the "Hat Man", who shares the characteristics of general shadow people but is named for a fedora or other brimmed hat on his head. Descriptions of the Hat Man date back to as early as the late 2000s.[12] The Hat Man is commonly associated with sleep paralysis and the abuse of the antihistamine medicine diphenhydramine, commonly sold under the brand name Benadryl.[12] He is typically described as having very few or no discernible features, although some witnesses have claimed they can "feel him staring" at them."
Which could have to do with the strawhat