The Hōsōgyo is a sea creature that roughly appears to be a humanoid shrimp
Their torso is shrimp-like, with a hard carapace on the pereon and a long, narrow abdomen like a tail. Their body is 2.2m long, with a 1.2m pereon an 1m long abdomen. They also have a 60cm wide tail fan. They only have 4 limbs, which are attached to the pereon. These limbs are flippers, with the front pair ending in a hand capable of grasping and the rear pair being stronger for land movement. The rear pair is a little longer than the front pair, being 1.2m and 1m respectively. The head is ape-like, but with proportions and dentition more similar to a horse. It is about 30cm long from the occiput to the lips. They have vertebrate eyes, ape-like ears, a humanoid tongue, a simian nose, and antennae like a shrimp
They are found only on the coasts of Japan. This is because they spend daytime in the sea and nighttime on land. A portion of their gills can process air with similar efficiency to human lungs. They are quite curious and inventive (though not so much as humans), and they also care for their young like apes do
The Earth they inhabit is roughly the same as in reality, at least for what would be relevant in this question
Given the above information, are there any niches that this Hōsōgyo could realistically fill?