I think that the negative implications of the OP here is undeserved and maybe a little misleading. In real life, with time, people change (mostly due to changes in their circumstances).
Steve has settled down with Cosette and neither have shown the slightest inclination of moving onto someone new. With stability comes maturity and Steve simply has laid off expressing the smooth, flirtatious part of his personality. Instead, he's focussing on being a good partner (maybe even lifelong partner) to the woman he's come to love. Additionally, his demotion to the tertiary level background supporting cast (making him about as significant as Jim) means that he will only be shown expressing the personality traits that is needed for the scene. Due to his relationship with Marten, it is being the calming influence when Marten is having one of his semi-periodic high-strung outbursts.
Dora has been through a lot. She's confronted some of her control issues but, most importantly, has confronted heartbreak (in the failure of her relationship with Marten) and has since been trying to build a solid, lasting relationship with Tai. Once again, bitter experience and maturity have led to changes in personality; she simply doesn't have it in her to be flirty anymore. She has a partner with whom she's happy and she doesn't want to jeopardise it. We still see flashes of her Doraten-era self, such as when she and Marten were boggling at the improbable music selection available in that bar's jukebox.
In some ways, her new, more 'grown-up' attitude was seen when she finally snapped and fired Faye. For years, she's tolerated Faye's quirks but, somehow, at this moment, it suddenly stopped being funny, idiosyncratic or even sympathy-worthy. It was just annoying, abusive, unwelcome and she wanted it out of her shop.
Hannelore is a very, very difficult example to judge. She actually radically changed personality shortly after being introduced. This was waved off as her changing her medication and this illustrates how difficult it is to judge what is 'in character' for her. Her mental issues are evidently strong enough that she can act out surprisingly strongly to minor events and, at other occasions, confront triggers head on and deal with them methodically (touching a toilet seat to win a bet with her mother comes to mind).
IMO, the current Hannelore is something of a product of her quest to have a 'normal' life. She is very aware of how abnormal her mindset is and how little experience of normality she has to date. An innocent, childlike demeanour is believable because she actually is approaching this new-found world with the mindset of a child who knows little and must be always questioning and always looking upon new things with wonder. Additionally, thanks to her friends, I suspect that many of her previously extreme behaviours (going without sleep for days to count things) have just naturally faded away. She has new outlets, such as in precisely counting and arranging the number of drum-beats in one of Amir's compositions.
Nonetheless (and, once again, this is seen in the bar scene the night before Marten and Claire hook up), she is still capable of the same wry observations.
If there is a meta-plot to Questionable Content, it is this: "We all grow up in the end. This is the story of how these people grew up; who they were, who they became, what changes they had to go through and what made them make them."
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Topic: Characters who have "Personality transplants"... (Read 8555 times)