A Shield/Slow/Snare/Haste is more than enough utility. It just needs to be gauged/tested yet.
thresh is tanky and ur pretty much dead when u land his q. karma cant go in as crazy as thresh and get so much benefit from getting in there. thresh also has a good damge on his auto atk. i havent rly played lulu but her lulu can go agressive playstyle and when they decide to atk back u can just turn them into that animal thingy. karma has nothing expept for a delayed cnare thing which they easily can force u to distance urself from them and end up withoud a snare only thing u can do is harras with q and w8 for gank. but that when ur adc makes a mistake its gg