Teemo needs something.

Teemo is just underpowered in general. Why is everyone faster than him? Why can everyone run him down? Every other MS boost is more powerful than his. Garen's lets him break free of slows. Yi's makes him immune to slows. Sett has one, why? Teemo can buy boots at lvl 1 and if he's laning against pantheon it doesnt even make him faster than panth without boots. Rumble's is better too. Why do 75% of the 139 champs have a faster or equal amount of MS to the "Swift Scout"?

He can't burst. He can't kite. He can't outduel anyone unless they misplay, and relying on someone else to make a mistake in order for you to do well isn't balance. Riot said that when balancing yas and zed. When played right they offered no counterplay. Whenever youre against teemo, that's how he can do well, when the other person messes up, he can't just do well on him own. Basically everyone outranges him, even melee champs. Riven dash range is about equal to his auto range. Darius e range is about the same as his auto range. Rumble flamethrower is about the same as his auto range. Malph q is the same as his q range and his ult range is way bigger than teemo's. Everyone outruns him. Almost everyone outbursts him. Morde basically has a better version of teemo's e on his passive. .4Ap on hit. What does teemo get? .1 and then .05 every second for 4 seconds, for a total of .3 ap? and morde gets an ms boost too. And morde's q and e let him trade effectively with teemo. Teemo is balanced like you can't trade with him, but literally everyone can. Nasus just presses W and then he can run past you and wait out the blind then q and e until you die. All the other ranged tops shit on him too. Quinn outbursts him and her blind works better, and she outruns him. Vayne can invisi for most of the blind, can kite better with her q and if anyone gets close she can e them away, and she can run teemo down with her passive. Kennen hits 6 and he gets a free kill if his ult and flash is up, or if he built protobelt. Ryze just out-trades teemo at lvl 2 when teemo is supposed to be the lane bully and ryze is supposed to be the one who has to scale. Same with Cass, though you don't see her top much. Vlad can just spam q and without flash ignite and a jungler you have no kill pressure on him, and since teemo gets outscaled by pretty much everyone no kill pressure means a lost game, although i think thats more a case of vlad being too much of a binary interaction champ than of teemo being underpowered, though i do maintain that he is underpowered.

Level 1-5 most champs can duel him. He's not strong enough to really be a lane bully anymore. And he scales rather poorly until very late when he has void and Dcap. Around 6-10 most of the people he "counters" are strong enough to slap him. They can just run at him. Nasus finishes sheen and merc treads, hits 6 and then waits for you to be pushed to river and he point and clicks w on you, runs at you and kills you. Darius has flash w or flash e, which can usually land him a kill, and he can just run teemo down once he builds phage and tier 2 boots. And teemo allegedly counters those two. Teemo counters garen allegedly too, but a garen with half a brain can just use his passive to stay healthy enough that teemo can't kill him and can pick up farm by spinning and q and then w if teemo tries to punish. And against garen, whom you allegedly counter, you don't want to kill him, because then you get villain, he flash q's you, spins and ults and you die, you just die. There's nothing you can do since silence prevents you flashing as well so you just die. Does teemo have anything where if he hits it you just die? Does teemo get a guaranteed kill as long as he has flash like any other champ? Malph hits 6 and if you havent shit on him and got 3 kills against him already he just gets to kill you. His q not only has better base damage than teemo's, it also has better scaling and it lets him steal ms so he can run at you to always be able to hit his e and wait out the blind so he can w too. I can auto a riven 30 times and q her 5 or 6, and she can be around 1/3 hp and if i just step a little too close she can e q1 onto me, with her shield eating my q damage, w, and by then blind is down, auto, ult, aa, q2, auto q3 auto and r2 and i die. she dumps one combo and i die. I can hit her way more than she hits me, and thats true with almost every champ. I can hit them with a mushroom and hit an aa, q, aa, and they get away. Most champs can dump their full combo on me and i just die. Why can't the reciprocal be true. Why can't it be, if they walk into a shroom and i can run up and auto q auto and ignite they just die?

The Keystone rune thing really hurt him too. He doesn't have a keystone that really works with him. The two best ones for him, Aery and DH, they both reveal him in his stealth. You also got rid of the raptor cloak items, zzrot and banner. I used to build both on him. You also released adaptive helm, which was needed for people like ryze and cass and rumble, but it makes teemo kind of irrelevant. The reworked wits end is kinda cool for bruisers, but it sucks for teemo. And this is just in top lane. If i brought up teemo mid, jg, adc, or support it would be a similar story, albeit worse. He can't clear jg well. Almost every mid outranges and outbursts him. Other adc's have more range and better self peel. And other supports have better sustain and peel and poke and utility and engange and disengage. The way shurelias was reworked makes it worse for teemo too. You released new ad support items that work really well for Pyke, someone who was already strong enough. You've made it so a lot of other champs can support now, but teemo support has fallen even further to the wayside. Shaco traps can stack and now attack everyone in range. Maokai saplings can stack. Cait traps can be put under the enemy tower and they can't do anything about them except wait them out or step on them. The increase in ult charges was kinda useless. If you don't die as teemo you don't ever get to full stacks if youre playing him right, even if you only had 3 charges. The bounce has very niche usefulness. The only real buff was the rank 3 range buff on his ult, which is nice when contesting, say, baron or drag, but the shrooms arent powerful enough on their own to make them back off and if you get in range to q, they're in range to jump on you and burst you in .33 seconds.

I don't know what teemo needs. I think a base MS buff to 135 would be all he needs, or a slight range buff on his autos. Or you could make it so summon aery and DH don't reveal him, maybe by adding something to Aery which states "if the champion which summoned aery is stealthed or becomes stealthed, aery does too," or make a new keystone that works with him and other dot champs, like what deathfire touch used to be. Or make it so the harvested soul doesnt go to teemo if he's stealthed, make it so it stealths too or something. Or make it so his w also breaks him free of slows and or gives slow immunity, or make it so the passive on his W isn't lost if he's damaged by turrets or champs. Or make his blind do what quinn's blind does. Something that lets him be skill expressive, or at least not be irrelevant. Maybe give him better base resistances or HP so he isn't killed so easily in dives, even when he's building resistances. Or nerf some of his many counters and stop releasing new counters for him or reworking old champions into new counters for him. A damage buff is the last thing i'd recommend, but maybe that would be in order. I don't think indirect buffs would work except for the aery one i mentioned, because they'd probably break other champs. If you buff liandries it will just make rumble and other ap stronger. Buffing void or morello will do the same. Nashor's is the only item i can really think of buffing that would help teemo more than anyone else, but it would also make diana, another teemo counter, stronger. Buffing aery or dh would break other champs.

Also we don't need you saying "teemo deserves to be a garbage champ, and if you play him you deserve to not have fun". A lot of people have said that about yas over the years, and zed, yet they remain meta, if not strong in the meta. Teemo hasn't been meta in years.