Cold Steel is just a reliant on anime tropes as Trails in the Sky.
Most of the Trails in the Sky characters are distinctive "carrictures" as opposed to rounded out people. They can be summed up in a single sentence. Zin is the boisterous monk. Agate is the serious, by-the-book warrior. Schera is the wise, aloof sister. Kevin is the loveable goof of a pastor, and so on. They don't have the flexibilty of real people or the thought provoking substance of the greats like Guts, Allen Schezar, Reinhard von Lohengramm, Fei Fong Wong, Cecil, and so on. To say claim that these characters are original or somehow less "cliche" than the cast of CS1 is to admit that you haven't been familar with the genre's older entries. These archetypes have existed since the JRPGs of the 90's, inspired by the anime of the 80's, which themselves were adaptations of manga from the 70's. Besides modern players being unlikely to recgnoize these cliches, the other reason why Trails in the Sky's characters are praised is because of their execution. Notice how very few characters in the cast stand on their own as interesting characters. For every Alan Richard, you get a Mayor Dalmore. For every Renne, you get a Luciola. Most of the so-called "great" characters in 'Sky are actually one part of a great pair. Without the Rusells to bounce off of, Agate would just be another boring, serious warrior who lugged around a gigantic anime sword. Without the mature Kilika, his evil former friend Walter, and their shared drama at the dojo in Calvard, Zin would just be yet another anime monk/brawler with Dragonball/Fist of the North Star superpowers. Kevin is an entertaining but ultimately forgettable character until his ruthless assasination of Weissman recontextualized his behaviour and lent actual depth to his character. When the execution is less than stellar, you get Estelle, the stereotypical ditzy tomboy and makes up one half of the oh-so cliche "energetic girl, brooding guy" archetype anime and manga have been using for decades. With poor execution, you get Scherazard, another "mature, wise big sister" who didn't even get to have her character expanded upon because her interactions with Luciola were so poor.
Scherazard and Luciola were orphans who were adopted by the leader of a traveling circus troupe. Luciola developed a crush on their adopted father, and when she was rejected after confessing her "love" for him, she shoved him off a cliff. She then promptly runs away to join an evil organization, made up of evil people who do evil things, because there is "darkness within her heart". Excuse me? This one of those moments where my suspension of disbelief was completely shattered while playing Trails in the Sky. The game had consistently given us usually empathetic motives that were always at least believable, but this was a new low for the writing. The game never goes explains what this vague "darkness is" and why that would lead someone to join this organization. Luciola's characterization has as much depth as a piece of cardboard. When interacting with Luciola, Scherazard's character is only marginally expanded upon by her sorrowful, empathetic, and forgiving reaction towards Luciola. Neither character goes anywhere, despite ostenisbly being the main characters of the Rolent chapter. In fact, literally everyone other party member get more development when they wake up from their dream than Schera and Luciola did with their dialogue!
As I stated in the Steam thread, CS1 uses archetypes as SHORTHAND.
That said, it goes without saying that Gaius and Elliot haven't gotten the same amount of attention as Jusis and Machias. As a result, they don't have anywhere near the level of depth as the latter two, but that's because this is the first half of the story, and their time to shine and receive character development happens in CS2.
On another note (I've already touched upon this), but CS1 also interweaves worldbuilding with it's characterization and character development. The main draw of the LoH setting is how the Orbal Revolution is overturning the world order, shaking the very foundations of society, tradition, and religious beliefs. Exacerbating the problem is that the OR is taking place at a far faster rate than our own industrial revolution, and society can't catch up with the rate of technological advancement. With so many characters in the ensemble game that is Trails in the Sky, you'd think that this would be a prime opportunity to tie worldbuilding and characterization together, but that never happens. Unlike CS1's cast, Tita Rusell and her specialization as a mechanic is the one and only character in the main cast whose life is even remotely affected by the very premise of the setting. All of the characters' family members who died in the backstory died independently of the OR's existence. Zin's story is rooting in wushu drama and DBZ magic, and Kevin is literally just a medieval inquistor. Compare this to Class VII, where most of the characters, who they are and what they are struggling with is shaped by effects the Orbal Revolution had on society. One need look no further than Jusis, Machias, Elliot, Gaius, and Fie for proof of that.