Hmm, I've always viewed Hereward as being more like Robin Hood, but a little less serious? Somewhat of a mix of both RH and Loki, where he's mostly aloof and quiet, but can be surprisingly heartfelt, or even brutal if he needs to be. For the most part, I see him as being more intimidating in a serious sense (Loki is intimidating in the sense that he's just chaotic) that people are wary of him bc they can't get a read on him; but he's actually quite gentle!

Also because he has a look very reminiscent of techwear fashion, it's easy to imagine him kind of being the kind to be surprisingly stealthy and quick! I know personas don't really have mobility in the game that allows them to be distanced from their wielder, but i can see him being into parkour also hehe.

Some smaller things I can see is that he doesn't mind being touched, although he doesn't allow more than just a brief pat on the arm. The only one who can get away with more (aside from Goro) Is Akira ofc <3 He'll willingly lean down so Akira can caress the little wings on his head, or let Akira crawl all over him like a lil kitten~ He indulges Akira VERY OFTEN. Also, he's not as chivalrous or wild in nature of spoken word like RH or Loki, but he is surprisingly /smooth/, and doesn't hesitate to go into in depth discussions on his (very high) opinion of Akira (mostly to tease Goro).

As for Raoul, I can see him being very similar to Arsene, but a little more bold. While Arsene stays true to his gentlemanly beliefs, Raoul isn’t too afraid to get his hands a lil dirtier~ That being said, he’s mischievous at most, and has a charm that prevents people from really being too miffed with him, like a cat that’ll inconvenience you but you don’t mind because cat first, everything second >:3 Raoul is very much more open to physical affection, handing out head pats, shoulder pats, and maybe even a hug from time to time. He spoils Akira a lot, and despite not being as “soft” as Arsene, still indulges the times when Akira requests cuddles.

Some small little quirks I imagine Raoul having is that he likes to tinker! Given his more steampunk design, it’s just something that sounds cute! He also likes sticking his leggy out all over the place, purposely stretching them, crossing them, and perching them wherever because he can~ His voice is a tad bit raspier, either due to him trying to come off as suave, or because he smokes. He’s very lively and loves interacting with the other thieves and their personas, but he’s especially sweet on Goro; shamelessly flirts and enjoys the his sharp wit and clever remarks. Also his little feathery ears!! They’re very soft and he coos like a bird when someone touches them~

Sorry this was so long and took me a while to reply!