There are so many options here, but let me reply under Eva with all the Hijikata options so I don't spam you!
Caster: They surely wouldn't want to quest together, but if Caster runs short on companions, Hijikata would escort her to pretty much any of those locations! Eva: He's scared of the Forest of the Lost Souls, but she supported him during his recent short-term loss, so he'd do it for her..!! But the other two locations would be easier on him, no doubt. Medusa: Their last expedition was pretty grueling, but let it not be said that these two are quitters! The tundra hills and giga shipwreck are fine (Hijikata will visit the latter for the quest, too), but he'd be scared of the abandoned amusement park and only come along if she were really eager to go. Mukuru: He'll ask her about the Temple of Death when she's back from her expedition!! He'll happily go anywhere else with her, too - the Survival Fortress is on his quest list, but anything goes!
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Caster: They surely wouldn't want to quest together, but if Caster runs short on companions, Hijikata would escort her to pretty much any of those locations!
Eva: He's scared of the Forest of the Lost Souls, but she supported him during his recent short-term loss, so he'd do it for her..!! But the other two locations would be easier on him, no doubt.
Medusa: Their last expedition was pretty grueling, but let it not be said that these two are quitters! The tundra hills and giga shipwreck are fine (Hijikata will visit the latter for the quest, too), but he'd be scared of the abandoned amusement park and only come along if she were really eager to go.
Mukuru: He'll ask her about the Temple of Death when she's back from her expedition!! He'll happily go anywhere else with her, too - the Survival Fortress is on his quest list, but anything goes!