So many things are pissing me off about Grimm (and a lot of those type of shows)
Dont get me wrong, Grimm is one of my absolute favorite shows ever and I wish it had a bigger fandom, but...
The show sets up for these GREAT characters and give them circumstances that it would make sense if those characters became recurring or at least make appearances is other episodes.
Holly Clark. You're telling me a teenage girl who was alone in the woods for nine years came out of it with OUT a major connection to the people who found her? Or the only other blutbad she knows??? The only person who could explain what was going on???? She just went to her Kehrseite adopted mother and integrated well into society?
Carly and Jarold Kampfer. You're telling me that Hank's goddaughter and best friend are NEVER even MENTIONED again???
Ariel Eberhart. That girl had the MOST potential to become a stalker, I mean faking her fiery death and walking out like a Boss Ass Bitch™ and you're telling me she just counted her losses after Nick KILLED HER FATHER and left? Unrealistic. Out of character. -12000/10
Gracie and Hanson. These homeless kids that Nick and Juliette very clearly bonded with, just fucking disappear? Never to be mentioned again? As if Nick would not take them out for dinner at least once a week and check up on them at all?
Zuri and Jared Ellis. Hank's physical therapist he tried to pursue and her brother. You're telling me they don't go for coffee once a month and that Hank doesn't call Jared to talk about video games? (Uh edit: uhhh nevermind kinda wish she didn't come backkkkkk)
Alicia, Juliette's college roommate who turned out to be a fuchsbau just dropped off the face of the earth and didn't try to get together with her friend and savior? You're telling me Nick didn't even call her when Juliette died???? Bro.
Max, Genvieve, Ivan, and Damien. Monroe and Rosales never called to check up on them? Didn't keep in touch with them after they left to get Max the help he needed after suffering from the umkippen?
Robin Steinkellner. She never said shit after Nick saved her life and got her abusive ex boyfriend and his brother arrested?
Sam and Dana Tomas. Wu was shown to be incredibly protective of Dana as they were childhood friends, but after the Aswang episode they're never mentioned again?
Angelo, Wu's cousin. Yet again, you're telling me Wu lives close enough to his cousin to visit once but never again? Bullshit.
Bélem Hoyos, the coyotl girl who turned into El Chupacabra, who's husband/boyfriend gave his life to save?
JOSH PORTER y'all this man went on a ROAD TRIP with TRUBEL to go back to his house after houndjagers chased him and his dying father across the country to get to Nick before his father died. This man found out that the stuff his father tried to tell him about, the stuff he thought his father was CRAZY for thinking existed... He found out that it's real. Like you mean to tell me this guy got home safely and had no more problems? No more houndjagers? Man didn't have nightmares upon nightmares? I think Trubel didn't even make it back to his house but he just went on living? Didn't look for her, didn't try to call Nick and tell him what happened?
Elly and the Naiads I mean Nick literally saved her life and you're telling me he doesn't pop in randomly to see how they're doing? He hasn't picked up some sign language from/for her?
Roddy Geiger??? Monroe had a come to metaphorical Jesus with him about talent and you're telling me they never get together and play?
Clay Pittman???? Like him and Trubel obviously made some sort of connection at the boxing ring, she was the first person who told him he didn't have to fight, and you're telling me they never run into each other and talk??
I forget his name but the little kid from the gollum episode who CLEARLY had an attachment to Trubel and Nick never got called in the middle of the night with "hey my son is having a hard time, can you give us Theresa's number??" Like???
Like the writers canonically made him a good father/brother figure to Trubel and a good father to Kelly where is our other evidence where is Nick adopting all of the kids he sees while working I mean he's a detective he sees lots of kids and teenagers ain't no way in hell that man doesn't play at least a small part in their lives after the job is done.
Trubel is clearly good with children and it's just never mentioned aside from when it's plot-relevant.
Feel free to add on with anyone I've forgotten. This is list is incomplete as I have yet to finish the series but still.