Every time I say "don't ban Udyr", people say "lol who bans Udyr?"
Every time I don't say anything and intend to play Udyr, he gets banned.
Also, from experience, the best way to ask for champs to not be banned is:
"[insert role] pref, do NOT ban ________"
Note the "NOT" in capitals with everything else in lowercase. This is required. Some people don't speak English well, so a contraction like "don't" might not make sense to them. Some people simply don't pay attention and will say "oops I thought you said ban udyr lol"
if you have 2 champs you might pick based on the situation, the best way to call them is:
"[insert role] pref, do NOT ban ________, do NOT ban ________"
On the other hand, doing it THIS way is a sure way to get someone to ban one of your champs:
"[insert role] pref, do NOT ban ________ [and/or] ________"
Because they will say things like "I wanted you to use Udyr, not Fizz" or "You said to not ban one of them", and will basically pick your champion for you. Writing out "do NOT ban" twice, and using a comma (instead of "and" or "or") makes it VERY clear that if they ban one of them they are trolling you, and that you are asking for BOTH to not be banned, not just one of them.
And the fact that I was able to type out all this "advice" is just proof of how much solo queue and this community sucks, because I have literally experimented with how to fucking call my role and champs and know what works and what doesn't, and kept notes of various different copy/pastes and their effectiveness.