Well here let me go into detail for them.
: Ability based, High auto attack range, easy to use, simple abilities. Don't need to combo properly to get the basis down.
: She teaches being slow, ranged, AD based, Shows how some champs not only have abilities that not only damage, but also have utility.
: Now about Karthus, I believe they need to show a AD champ then an AP champ in the Tutorial to show two different sides. Karthus is a very unique mage, very noob friendly. Spam Q to farm, last hit, Use W to slow someone away from you, the E when someone dives on you, and if you see someone low, far away, Ult. And if you die, you can still do damage, that its "okay" to die, so some noobs dont get too stressed out, and even in death, you can still be rewarded if you play right.
: Just like annie, Damage abilities, a self AD buff, movespeed buff, and a heal, very basic from most MMOs to learn from.
: Melee based, ranged Spell, a stun, AoE damage, and a Teleport Ult, plus has a little "neat" passive to teach to noobs to get them into reading and learning unique abilities to watch out for.
: Honestly Xin and
are probably the two easiest junglers in the game, so perhaps release a new Jungle Turt for them to play with, he has Self sustain, CC, and a Dive to show noobs what a sustain champ/duelist is all about.
: To teach noobs how to get freelo.