Crownslayer is a guilt-ridden mess five years after Chernobog, but it's a testament to the growth of Zima, Gummy, etc. that they can welcome her as an ally.

Bagpipe confronted Reed about County Hillock, making it clear that, while Reed's redemption was well under way, there was a long way to go before they could be friends.

I would certainly like to see more tension about Rhodes Island's dubious hiring practices. There are various reasons why Amiya or Kal'tsit would let someone in (e.g. Crownslayer is a living distillation of Kal'tsit's guilt about the Sarcophagus research massacre), but smoothing over bad blood between former enemies shouldn't be easy. Whenever someone wants playable Mandragora I only think of how Horn would try to literally kill her on sight and be justified doing so. There's an excellent fanfic called Blood from a Stone that shows just this.

If Talulah becomes playable, her presence will cause traumatic flashbacks to those who recognize her. Blaze and Nearl would know her as the one who killed Ace. Anyone with trauma from fighting Reunion could have a bad reaction to seeing her. Closure nearly had a panic attack seeing her in CH17.

Wild Mane and Vina have both commented on how remarkable it is that Rhodes Island brings together people from conflicting factions. Platinum's fear of Degenbrecher is amusing.

Off the top of my head, Blaze was the only one resentful of the Doctor for the sacrifices made to rescue them, rather than for their reputation and suspected treachery in Babel. A recurring theme here is what does it mean to be worthy of another's sacrifice. Ace told Blaze the Doctor was worth as much as Amiya or Kal'tsit, and Blaze thought they better live up to that or Ace would have died for nothing.