I'm not signed up for the game, however if there is an appropriate place to put the fact that he's in the game on the page go ahead. As you say, he's neither in the story or a boss, so maybe right now the trivia section is a good place?
Probably. Once he'll appear in the story, I'll change it.
P.S.: I do play in X DiVE in japanese, yes. But I do this not only to record the stroy's script in one of original languages (I think original script is japanese one or else we would have RiCO's voice clips in chinese) as there's a lot of english-language recordings, but not in japanese. I also do this to try and see if english script got censored or not. So far I can't see the actual censorship, but it the english translation is a bit raw so it all might change in the future, in worldwide release. I myself don't know japanese much, my friend sometimes helps me with translations. But so far, it's all OK.
I have the recordings on the plot (from 1st to 4th chapter so far) on my channel. If we'll not do this, other people that know both english and japanese will be able to do this anyway.
Also I think Icy Penguigo (I mean Chill Penguin) has a verbal tick in japanese version. I don't remember if he had it in everything related to Irregular Hunter X, but here he ends almost all of the sentences on -kuwa (クワッ). Here, take a look.
Just remember to add categories to them. You can do so at the bottom of the page where it says categories and has the "add categories" button. Start typing in "Rockman X DiVE images" and when it shows up select it and hit enter, then hit done!
I don't have Chapter walkthroughs. I only have the recording of every non-tutorial dialogue in the story. I can't record gameplay because of how my game chuggs when recording anything.
I have a showcase of White Day's Alia and Cinna-chan. You can actually view the models before getting the Hunter Program. But if it's a skin, you can't view its 2D model. I've only did this with those two characters as I wanna see the animations of characters I get for the first time. I don't wanna spoil the suprise for myself :D