I am just saying, it's part of what there is to learn.
There are a lot of things to learn. Classes. Is one of them. You're not a gracious receiver.
I, when I began playing league 4 years ago, started playing, never worried about team comp. I just knew a few champs that I liked, played them in their respective roles. I was told there are assassins, supports, tanks, fighters,adcs, and mages. I saw someone on fire, mage, i saw someone with a bow, adc. I scrolled through the store, fascinated by all the people, and read about them. I watched champion spotlights, learning who people were.
I played a different champ every day, that's how i learned what they were in terms of class. I looked them up in the store, or observed how they did things in game, and drew associations from that.
That's how you learn what class people are.
There is no way, whatsoever, to see it in champ select. So you either need to be an intelligent observer in game, or a researcher out of it and peruse the store, or the internet to read about them.
I didn't spend hours memorizing everything, I did it bit by bit. I went into my first pvp, and a chain dragged a minion into a bush and I was terrified, people everywhere did things I had no clue, but I took it like any game, identified a pattern, and tried to memorize as much as I could while i was in game, then after I looked the characters that interested me up.
I also bought every 450 immediately, learned them and what they did, their class etc, and then I started buying other champs I liked. By looking at characters you can basically tell what they are.
Either take my experience and learn from it or dont kid.
I'm done here. You will do what you want anyways. At least you gave me something to do over the past few days, albeit it wasted my time because you wanted to do things your own way.
If you can't look at Karthus and Identify that he is a mage, or look at Garen and know he is a tank, then you need to work on your deductive skills