Whether as policemen or guild adventurers, they'll have plenty of opportunities to work together! It's funny to me that Hijikata works with Flynn so easily when he always butts heads with his assigned partner Dojima, but that's just like for him.

As for the current quest, should we have the ice maidens take a liking to Flynn, drop the illusion and try to capture him? (He is cuter than Hijikata...) They can fight their way out of that (Hijikata's fire should come in handy)!