Karma's Identity
So Karma is an interesting champion. She can perform pretty well anywhere. I've seen some high tier players jungle/top/mid her as well as the usual support spot she's put in. However I personally think she'd be a stronger champion if Riot focused on one role and gave her an identity, an area she excels at. All of her three spells are good but everyone can do them far better. Janna's shields are way better for example, while there's stronger and longer range poke champions in the game. Ones who's skillshots dont get stopped by minions. Her CC is some of the worst support champion CC in the game. It's huge build up for a single target root. Not a stun or knockup, but a root.
Basically first thing's first. They/we need to figure out where we want Karma to excel. As a mage or as a support. As of now she has two Mantra spells that are vastly superior when you build/play offensively as a mid or top or etc (Mantra Q and W) and her mantra shield/speed boost is something you'll cast more as a support. Once they figure out if she's going to be a ap mage or a support, all of the mantra spells should focused on serving that role. Her Mantra W personal heal was ONLY put in (according to Riot when they rereleased her) because old Karma's passive made her deadlier the closer she was to death. That passive lives on in that spell. That spell is useless as a support though. If Riot wants her to be a support it should be remade and Mantra W should amp up the CC by make the tether infect other nearby targets or changing the rope into a stun or pulling the target towards you at the end, etc. Anything supportive instead of a selfish heal. Just spitballing. If they want her to be an AP mage then they should rethink Mantra E and make it something more suitable for a midlaner or something. It's alright as is though but an Ap carry might enjoy something else.
TL;DR: Figure out what Karma is and focus on making her that by editing her Mantra spells. Currently not all of them work well in every role so you end up just spamming 1 or maybe 2 of them at most. Not as much depth/choices as you'd think a champion like her would give the payer.
Other things that are noteworthy would be:
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Her Mantra. Some people note that old Karma was more fun because Mantra had two stacks that could build up. Currently you only have one stack. If you fire off a Mantra spell you have to wait a long time for the next chance to use Mantra again. Mantra Q is typically the go-to Mantra spell on current Karma, but on old Karma since you had two Mantra charges it was impossible to fire off two Mantra Qs in a row due to CDs. This encouraged players to mix things up and mix in the less go-to Mantra spells. I think its something Riot should consider bringing back after hearing someone describe this. Generally Mantra W is gathering dust when playing Karma, only being used situationally while you fire off at least 50 times as many Mantra Qs. With two charges there's more excuses/chances to fire off something other than Mantra Q.
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Karma jungle damage. It'd be nice if Karma could use W tether on monsters. If I play her mid and go and take blue it's kind of sad how few abilities she can use on jungle creeps and I have to fire off a Q every like 5 seconds to help them damage it. And if you fail to kill the Blue Buff with a Q you have to stand around an embarrassingly long time before you can Q again.
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Skins. Nothing to do with gameplay but this poor girl could use some cool skins. The last one was nice but personally I think the pants were a little disappointing. They looked a little misshapen, probably so the artists could avoid clipping errors. I was fonder of the concept art: http://fc09.deviantart.net/fs70/i/2014/279/c/c/order_of_the_lotus_karma_skin_ingame_art_by_yideth-d81vssg.jpg One thing I love about Karma is her tattoos light up like Avatar Aang when she uses Mantra. With the pants and sleeves you just can't see that at all in the final skin so she ends up looking generic.
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THE CAPE! Nothing to do with gameplay but on her default skin her cape is very flat looking Like it flaps up and down like cardboard behind her. It could use a more graceful animation if possible.