so violent. I thought league was all cartoons
Violent waifus. Video was so good.
Anyway, my list of heroes to be...adjusted are as follows. I'll say first that I'm hesitant to suggest any meaningful changes until we see how people adjust to these new strategies with the tools they currently have available. I feel like a lot of strength we saw from certain picks was secondary to teams not being ready to come up with strats and picks that effectively counter those picks. As such, I think it makes sense to observe things for a couple more months before making any changes. That said:
Lycan - Hmmmm. (a) Make Howl only work on him and his wolves, (b) change Howl from global to some sort of AOE, or (c) make Howl only work on heroes. I feel like his early game and midgame pushing power are the problem here. Particularly in lineups with lots of summons. If you take away his ability to empower every summon on the map, you limit the desirability of the "hard push" wolves + necro summons builds or at least slow the speed with which that approach takes hold. I think one of those 3 options brings him into a bit more balance, with a lean towards "a" or "c". Alternately, you could always raise the cooldown on Shapeshift. Make it riskier for him to split push on his own before he hits level 16 and...he probably split pushes less often.
Brew - Idunno. He's very fragile, imo. He only went 50% during the main event which is where you want heroes to be, IMO, and he was popular because a given strategy synergized well with what he offers. Perhaps a little more observation in order to see how teams adapt and to determine if the hero is the problem or if people's inflexibility in adapting to what he does is the problem. The couple of times we saw Lifestealer, he fucking murdered the spirits. My initial thought is to leave him as-is. Raise the mana cost of clap if you must do something.
Razor - Well, he did win ~80% of his main event matches. But much like Brew and Shadow Shaman, his newfound success feels more a function of a shift in the meta rather than the hero being too strong. He's really strong against this meta which often featured just 1 heavy right-clicker. If the meta shifts back to 2 or more, he falls back into a midtier pick, no? I suppose you could always give stat gain a little love tap. I wouldn't touch the ult or the range of static link.
Doom - Idunno, but almost a 70% win rate on the main stage suggests something is up. Seems to me that the meta just shifted around to make his existing kit work so well. He feels like he's succeeding for the same reason Razor is, and that if the meta shifts back to multiple right-clickers, he goes back to a midtier pick, no? Again, I suppose you could always give stat gain a little love tap. Otherwise...I just think he was really strong against the accepted meta rather than the hero itself being a problem.
Naga - Reduce the duration of illusions. The ability to control 3 lanes with one 15-minute item purchase (radiance) just feels problematic to me. Trim them down from 30 second durations to...idunno maybe 20 at all levels
or make their duration scale with levels to something like 15/20/25/30 to force people to choose between long duration illusions that don't have any riptide damage, or short duration illusions that can only help you split farm your jungle a little during the early and midgame. Also, change illusion damage take scaling from 500%/400%/300%/200%
to something like 500%/400%/350%/300%. She shouldn't simply be a straight-up better version of Phantom Lancer.
Lina - She needs still more love. I'd suggest buffing her stun duration and damage. from 1.6/1.7/1.8/1.9 to something like 2 at all levels, and starting at 125 damage instead of 90. Makes her stun similar in relevance to Leshrac's. If not that, maybe you have to look at decreasing the mana cost of Dragon Slave. Maybe a little of both.
Medusa - Idunno. Maybe re-address the scaling of mystic snake to do more damage in early levels while remaining the same at level 3 and 4. Gives her a better power curve and transition from early game to midgame.
Crystal Maiden - Eh...I guess you could buff the damage from her low-CD spells. Maybe increase the slow duration on the Q. Other than that...i suppose further buffing her passive could be useful too.
Overall - I think adding more armor to T1 towers should be considered. Not a lot more; just a little more. Maybe +5? You don't want to hurt the early-game champs like Chen and Enchantress, but you also don't want push strat strength to feel completely overwhelming either.
....
Eh, that's all I have right now. I think Shaman is fine; he became a strong pick because Brew running interference for his serpent wards became a strong option. NP and Ember feel alright to me, though I wouldn't be shocked if I saw a small hit to Ember's early game shield or the number of serpent wards. Dunno how to fix Huskar or Spirit Breaker.
These are all just initial thoughts on the matter. I haven't looked at any hard numbers, so it's all subject to much change.