Among the 3, Taiga showed most improvement and she is barely recognizable now from episode 1. In terms of character development, she wins by huge mileage. She might still have the violent streak but it is tempered with compassion now since she is receiving human warmth that is markedly absent in her entire life pre-anime series. She is perhaps one of the loneliest girl in anime series I seen so far but thanks to certain someone, she is now getting back on track on being a self actualizing person. Which is very impressive to me. 

Ami's refusal to be honest is the reason why she is stuck with her own impasse, hence her frustration is bottled up and she often take it out on Taiga. Worst part, she knew it herself. Her character development is glacial but explosive when it happens. A worst manifestation of her Jekyll/Hyde personae dramatis. She is hot, seductive but ultimately stagnant due to her own mind games she played on herself and Ryuji. However she believes in action and decisiveness, which is why realized from day 1 that she missed the bus sorely in fight for Ryuji's heart. She settled to be a counselor and devil's advocate in the series but her emotional pain did peek out once in a while in tantalizing moment which predictably missed by Ryuji not just because he is stupid but also he has reason to believe she is faking it due to her record past. Just as Taiga, she is another very lonely soul but she did get her kickbacks a little in this aspect but unfortunately she is too conceited to admit it to Ryuji especially. This is why despite her fascinating complex character, she is "stuck" now. 

Minorin fake cheerful self is counterproductive despite her inherent kindness, she is seeing a future beyond relationships despite her feelings for Ryuji. Her semi ignorance of his feeling after the Christmas episode is major negative point to me and I actually agrees with Ami's anger towards her. It looks like she is trying wriggle her way out from this by do nothing. This is worst thing a person can do in my opinion. Minorin is another lonely girl but she covering it up with her antics with propensity to run away from any emotional conflicts if she sees fit. Or do nothing.  She is not mature and selfish, certainly leaving people on the lurch but quick to anger if these being pointed out. On good side though, she is a loyal friend. 

This leads to serious emotional catfight between 2 while Taiga is stumbling towards Ryuji in steady pace.

there's no particular reason for me to change what you've been saying on these anime.

We all knew that this story was meant for Taiga and Ryujii, the tiger and the doragon.. the other side characters were only a twist of timeline just before ryujii and taiga merged as steady couple.

something about minorin that attracts me so much. Apart from girl in Ryūji's class, she's also a close friend to Taiga. Her smiling and cheerful attitude is what makes her so special. For some reason, she could be a perfect girl in school but this anime wasn't about minorin but i was meant for this couple. What keep us from mystery, was the fact that she had something hidden like a big secret that even taiga herself didn't knew. She's also had an advantage in sports though at the same time she holds many part time jobs. Her air-headed problems sometimes causes people to pick up thing from her. There's one ep where she say taiga crying mad and shouting ryujii's name. that might be the reason why she had to reject ryujii indirectly. Maybe it's because of we can't see on what's missing when we're talking about taiga and minorin relationships and also before taiga met ryujii. the story makers just want to make it more emo by adding minorin into it and it's already trapped me to like minorin more than taiga.. minorin is the close nemesis for taiga and if taiga didn't act fast quickly, she'll took ryujii from taiga's hand. (Even if i had red their manga) I am still pretending that minorin still have the chance to be with ryujii. but sometimes i could see that minorin was reacted awkwardly when talikng with ryujii..

and move to ami kawashima. She had everything that a guy wants in a girl. Tall, beauty and compassionate.. Ami stand tall before kushieda and aisaka. He's a very popular idol for some from her class..  She is always kind and generous towards others, though this is merely a deception. In truth, she is arrogant and will not hesitate to use abusive language towards others. this leads to her disadvantages on getting close to ryujii..kawashima works in modeling field but that advantage also failed to attract ryujii in the other hand, she has to choose which one is the best..
In the current ep, kawashima fought with minorin cause she already knew that she couldn't win if she can't play it dirty. Current ep make us felt very tense and thus we kinda hate ami a little than before and slowly building trust and hope in useless taiga. Refusal to admit her fault.. ami has fall to the last place for ryujii's best choice. for me, she has only had her figure nicely done but she lack in saying things that she wanted to say it directly.