I looked at various characters, and now im showing you guys it. I'll send in the other few character analysises after this.
Robinstorm reads as a grooming victim to me, the way he acts is akin to how spottedpaw had acted with thistlestar, albeit it was not romantic or sexual, he displays most of the same behaviours that grooming victims do.
He also displays the same behaviours and reactions of a traumatized child (meek, people pleaser, scared, etc) towards Lightningfur, to the point he was willing to literally exile himself to go with her because he didnt know who he was if he was not lightningfurs former apprentice
From the scenes that we've seen and behaviours in later chapters, Lightningfur physically abused him (and possible also mentally abused robinstorm) to the point he has scars and a torn ear (iirc)
He is unhealthily attaches himself to her, idolizing her the same way spottedpaw had idolized thistleclaw, in robins mind, lightningfur can do no wrong and do no evil, even after seeing her slaughter her own mother, the cat that birthed and raised her with love.
He also shows major panic and fear at the fact he considers himself to be "replaced" by featherpaw, he doesnt want lightningfur to discard him
He also quite literally cannot/does not know how to function like a proper clan member without lightningfur, he was literally forced into silence about what she did to him and how he was treated.
This also all happened while he was still mentally developing (aprox. 0-9 in human years, which converted should be aprox. 0-13 moons in wc time) and was easily impressionable, lightningfur employed groomer tactics (a.e threatening to hurt him if he spoke out, which is exactly what most groomers do), attacked him, i dont really like using this term but, she literally brain washed him into seeing her as literally unable to do no wrong/better than starclan and that what she did to him was normal.
He literally considers himself to be completely worthless and worse than dirt if he is not being ordered around by Lightningfur, seen by how hes implied to literally constantly try to be the perfect apprentice/warrior and make her proud him
This may be me overanalysing but whatever, also robinstorm reminds me of Choice by Jack Stauber and Pure as a lamb by Baby Bug :3c
HELL YES I AM LIVING FOR THIS ANALYSIS
you are SPOT ON literally Lightningfur is just continuing the cycle of abusing a kid, because Thistlestar did similar to Tigerstar as well (and obviously he was sexually grooming Spottedleaf, Grasswhisker, etc. as well). Lightningfur is NOT A GOOD CAT. At all. She HAS moments of "goodness," but not only is she OPENLY horrible about her actions, but in secret, she is way worse.
All of Robinstorm's scars ARE FROM HER, or her training. SHE RIPPED HIS EAR OFF and then told him not to tell anyone and also insisted he didn't need medical care for it! She wanted him to be strong and powerful and when it turned out, hey, babies don't come out the womb fighting soldiers, she was pissy and didn't want to "waste" the effort on him. She just wanted him to magically become good, but obviously he CAN'T, and he internalizes that. He just wants to be good for her, but he also knows that she doesn't give a shit about him!
While she doesn't give Stormpaw any scars, she is very verbally abusive and demeaning towards him too, even neglectful as a parental figure. The only reason she didn't hurt him physically too is because he was Silverstream's kit.
She was kinder and better towards Featherpaw for the sole fact that, not only was Featherpaw Silverstream's kit too, but Featherpaw looks like Silverstream. And Lightningfur would never hurt Silverstream.
All of this is 100% correct.