Take
off that list, she isn't a good midlaner, midlane is a harass lane while toplane is a sustain/farming lane, as most midlaners are more concerned with either bullying you out of lane or getting first blood so they can start roaming, unlike top lane they will forsake entire waves of CS just to force you to recall to base, and Riven is going to get harassed like crazy from range.
is always fun, her extremely weak early game teaches you how to roam, how to survive harass, and how to get every last CS. She gets banned a lot unfortunately, so you may have to practice with her in team builder.
will be able to outsustain most other midlaners, and she brings a fair amount of hybrid damage to the team, along with an ult that will save your teammates on multiple occasions.
is quite balanced, and she is a huge asset in teamfights if you use the empowered shield.
is a balanced, annoying, and easy to learn midlaner who scales very, very well with AP. One of the few supports in the game who is capable of hypercarrying (have seen it happen).
can prosper mid lane, just be sure to time your alpha strikes so you can dodge skillshots AND damage your opponents. A safe strategy is to max his W first and buy only mana potions, it will be literally impossible to force him out of lane once you do that, and his roaming potential is unmatched.
is a well rounded midlaner, I suggest trying him out and seeing how you like him.
can be a pain to use, since his ability to land his Q's can make karthus either a lane bully or a worthless opponent early game, and his Q's take a significant amount of skill and practice to land. Combine the fact that he has to be very close to do damage, while being extremely squishy, and it's easy to see why most players don't bother with learning him, however, his defile, once leveled, does incredible AOE damage, his wall is a free DFG for the entire team, and his ult has some of the best potential in the game.
has relevant damage at all stages of the game, and his ultimate let's him roam with brutal efficiency.
is a reliable pick midlane if you know how to use her, and her black shield can negate most of the damage mages will try to inflict on her.
is a very fun midlaner that does great damage and is extremely useful in team fights.
builds mana in his build so he can usually sit in lane for quite a while, combined with easy last hitting and a very strong late game, he can always be a good choice midlane, even though your early game may be painful, you will always outscale the enemy mage by late game.
is capable of midlane, I have seen players do it and absolutely destroy their lane, I would just imagine the mana problems would be frusterating. Perhaps
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can midlane, I learned that after last pick trolled me and went jg anyway, forcing me to take midlane. His Q does a suprising amount of long range damage early game, his W allows him to nullify the skills that mages need to land to start their combo, with good timing and reaction speed you can block every single attempt a mage makes to combo you in-lane. His passive allows him to sustain himself in lane, and his E can be used to zone his opponent if they try to harass him out of his CS.