I'm a bit confused about it as well. I guess it's the same person, but it's weird to me that he's suddenly a captain and next time he's back to being a sailor? I agree with the post above though, the seawater must not have a good effect on your mental health lol
my head canon imagines a ship full of gullivers with different uniforms lol
i think gulivarr is the captian of the ship
and gulliver is like a lower rank in the same ship
or maybe they come from different ships..
hold on... on a more serious note, now i read that gullivarrr's pupils are X shaped, meanwhile gulliver is +
i never noticed that but i do noticed that his voice is different but that could be acting
other than that & his clothes, everything else is the same with gulliver! which is strange, so they could be twins or brothers