I feel like there's been a heck of a lot of anime-only content in the current season. It's pretty good anyway. It feels like the anime-original content is actually filling in gaps in the novel instead of trying to go its own direction (most of it seems to be taking place during a time period that kind of got skimmed through in the novel (Katarina's senior year at the academy).
I particularly enjoy Frey and Ginger (who replaced Nichol and Raphael on the student council after they graduated) and I don't remember them actually getting named in the novel. Nichol and Frey seem like they're a complete fit for each other (as friends, no romance ever). Ginger seems to want to join Katarina's harem, but I'm guessing she didn't make it there in the novel because Frey got to her first. Frey seems to be very interested in Ginger. :-) Frey doesn't want to chase after Katarina as a follower like everyone else. She wants to BE Katarina (well, be like her at least). She felt trapped in the nobility and was inspired by Katarina to untrap herself.