Don't include Eve or Akali on your list though since Riot wants to a bigger rework on them than what the assassin update could do for them. In no particular order these are on my wish list.
PhDs Nuts3 votes
As long as immobile champions are able to participate in games with assassins, I'm cool with it.
Titanium701 votesWell... that might be the perfect answer! x'D
MohawkBird1 votesI mean assassins are direct, hard counters to immobile carries. It's not like that will ever change.
Zarvanis3 votes
Chief Mayonnaise3 votes
MrBuffington2 votesI think if you swap Shaco for Fizz, my list would be basically the same as yours. I'd rather see them put more work into Shaco, similar to Eve or Akali, since he's a pretty weird champion
Oakleaf Ranger1 votesI don't really think Fizz is in a bad spot after the tank Fizz got nerfed. If they did anything to fizz I would hope it would be to change his passive and make it more powerful while taking away power from his other abilities for what would hopefully be a more healthy champion. I definitely feel Shaco could be one of the main 5 0r 6 though as his individual abilities don't seem work well with each other.
MrBuffington1 votesMostly I don't like Fizz, lol. I mean, in general, the fact that a supposed high-risk-high-reward character has such a reliable and frequent untargetability spell feels bad...
warpenguin5552 votes
Nekusen2 votes
Masala Chai1 votesDiana is sadly classified as a Diver, and thus will not be receiving changes.
Nekusen1 votesDiana is sadly classified as a Diver, and thus will not be receiving changes.
yes, but she is still an assassin though.
Oakleaf Ranger1 votesThey want to focus on champions that are primarily assassins but not the ones who could be/are classified as secondary assassins like Diana. They might do small tweaks for champions like those though.
Arakadia2 votes
Bonipherus2 votes Are the 3 who I want changed so you have more counterplay against them than "better have instant cc on your team or you dead lel"
Need tank and off-tank builds absolutely gutted and so that if they miss their ults they still can't just fall back to reliably dueling someone with just their 3 abilities and auto attacks
I would have put 
and on here but I believe the current dichotomy of stealth needs redone in order to actually bring a balanced environment for these champs so I'd wait for that first and just put them on the smaller-scale reworks.
I'd want a smaller-scope rework to make her a primary mage and a secondary assassin similar of how they changed 
ShinkoMinori1 votes
Oakleaf Ranger1 votesI guess there must be some unheard of meta going on if these guys are assassins
Arakadia1 votesI hate those assassins, always bursting me down!
warpenguin5551 votesassassin poppy is so fucking fun
BLYAT moon Akali1 voteskassa gets shit on by ad champions in lane too much to the point where he is only viable as a counterpick, rengo still offers virtually no reaction window if he ults with enough bonus movement speed, talon is way too easy to play for the (aoe) damage he does, leblanc is a no risk high reward champion, fizz' level 5 e cooldown is still too low for what it does when taking into account how easily he can get cdr (it's on his core items) and his passive is kind of out of place.
kata is too unreliable because she's a walking ult.
Astôlfo1 votesNone of the assassins are really broken or OP. Some of them are badly designed in a non-numbers way. But the way people cry would make you almost think it's the former. lol But of course the crying QQers will downvote this to oblivion.
LankPants1 votes
Past that I don't really care.
Valor Bot1 votes Fizz: Fizz has several counterplay issues that need resolving, IMO; namely, that his passive gives him a free, low-interaction advantage against AD targets, making it feel impossible for them to punish or retaliate against him in lane. If he had a cooler passive that fit him thematically and didn't give him such an out-of-place advantage against physical damage dealers then that would just be a win-win overall, I think.
LeBlanc: As one of my favorite Champs, I'm hoping she'll get changes that will push her deceptive playstyle even further, but not to the point where it no longer feels like LeBlanc. Also hoping any changes she receives will put her in a better balance spot overall. Curious as to what her strategic niche will be after the update.
Zed: I look forward to seeing Zed's weaknesses and/or windows of vulnerability become much clearer post-update. He should have to make meaningful tradeoffs for his reliability and safety as an Assassin, and 'delayed burst' just doesn't strike me as one of them. Thematically, though, he's a cool Champion so I think he's fine in that department.
Talon: I just think this dude could be a bit more cool and unique all around with the right changes; currently, he's all about blades but has little else going for him. Maybe if he had some utility to offer -- or perhaps a bit of added safety during assassinations -- he could actually boast of more 'high moments' in his kit while having a way to GTFO once he's done killing a squishy target.
Rengar: No more 0.0000025 second one-shotting, please.
Akali: See Talon.
TL;DR: Most of these Assassins could use changes that push their thematic further while allowing for cooler and fairer interactions in-game. Hoping that each one will have clear reasons to be picked over the others come the update.
Lady Hammerlock1 votes :is a game health problem and needs changes not to mention she feels more like a "juker" then a deceiver,there isn't much deceiving in her kit tbh
:His kit is pretty old and his passive is one of the most stale in the game
:Cant have power because of his absurd ultimate and is to reliant on picking into mages
:Being able to kill in less then half a second from stealth is not balanced what so ever
:Beyond frustrating in the right hands,Beyond useless in the wrong ones
USG Failsawce1 votesThe assassin I wanna see reworked the most for this update is 
Please rework him.
Blue Moon Wolf1 votesI think is actually a candidate for the class update. I know is definitely on the list for a full rework, but that's also because she needs a VU really bad as well. seems to only need an updated kit, to which a class update can handle. Though if I had to pick, I'd say:
: More so cause of how old her kit is. She could use some new toys in her kit.
: Mostly if they do update invisibility. But if that's the case, there are a few non-assassins that also will need some work then.
: Last time I played her, I could tell how big of a gap my skill with her was compared to someone who plays her regularly (not necessarily mains her). She is pretty much is what I'm worried 
is heading towards after all these nerfs he's getting.
: I don't care what they do, as long as they make his troll pole less "trolly", I'm fine.
: Practically what "we nerfed him till we forgot he existed" looks like. between his joke that makes no sense and his Ult that consumes large amounts of mana PLUS can only be used so many times in a row, he almost equates to what 
will be in the Diver update.
Calabok1 votesNerf them all including