why not marvin ?
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A smartass answer would be because the title of the game isn't called, "Marvin and Anna." But the real answer would be that there are other characters that move the story along.
However, a good storyteller would hint at other things going on in the background to set the release after this one up. Maybe just a mention of 'something' is up.
We know Grant has a meeting with Anna latter and perhaps a little mention of that will come up. At some point Anna has to arrange babysitting for that event. Would or should that be in this coming release? I don't think so being a little too early--and honestly would make for a good David/Anna argument when Anna tells David she is meeting Grant. However, some mention of the meeting ought to be mentioned as a way to remind the player.
Could Marvin make an appearance in this release? It's possible but in the context of interactions with the other characters--likely with Kendra. Perhaps Anna and Kendra have an event and Kendra asks Marvin to work behind the scenes to further Kendra's plans.
So why Robinson and Darren? We barely know them, and they haven't had much screen time to figure how they are or will be involved in the game. Or maybe the developer is using either or both of them to further other plots as well as put them in play.
Robinson at best is the busybody neighbor who has had some positive contact with Anna in the past. And that is pretty much Robinson in a nutshell. Problem now is David is back in the house, so evening visits with Anna is pretty much out... babysitter is there morning through the afternoon makes Robinson visits complicated. Nevertheless, the developer wants to bring Robinson into the mix--so it will be interesting.
Darren and Marcel got a good intro in the last release, Marcel more so. But Darren and Robinson have the same problem; Anna isn't interested in either of them. I can't recall even if she really knows Darren so if it's the developers wish to make Darren a love interest, it will be a long road to develop that arc.
Hank--well hell that is easy. He has to set the stage to make his move on Anna