There is a lot to be said about players in regards to their name and their name choosing. I actually have a tendency to judge people from quite early in regards to their name.
A lot of people have "rep" attached to their name and will hold it dear and these are the people I respect the most as, while everyone has shit days, explodes, or sucks, most of these people will tend to behave better due to trying to give their name a good standing.
MYTEAMSUCKS / SUPERMIDA 101 MID OR FEED / FUCKING PERUVIANS / FUCKING WHATEVER / CAPITAL LETTERS CURSING SOMETHING
Players with a high tendency to rage and sincerely believe from the bottom of their tiny hearts that they're good. Also, usually noob.
#RoadToX: Feed feed feed and blame team.
человек говорить/ebanyi katka etc.: Pick invoker mid or void safelane and speak russian all game disregarding people saying they can't understand.
twitch.tv/x: Go watch stream to find wards and deward them.
VOLVO GIVE GOOD TEAM/My team is shit/MMR SUCKS: Have 0 impact all game. Not necessarily feed, just no impact.
Well tbh if the twitch.tv guys are too dumb to use an overlay to block important info they deserve to lose xD
Standin.x.HyperX/Standin.x.INT/Standin.x - doesnt speak english and probably will feed
This has taken me a long time to admit, but I think, in my experience, 'MID FUCK OFF NOOBS' players are usually pretty good at mid :/
"These cross symbols "††": South American. Likely to chatter over voice chat in Spanish."
I'm South american and this is literally the first time I've seen these symbols posted anywhere? lolwut?
Badger: Yeah I really hate adding anything to my name. It just feels wrong.
Zano: I've only seen them a few times, but nearly every time they've been south americans that like to voice chat in their native dialect.
Also I added some more to the OP that y'all posted.
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Pro player tag (NaVi.Dendi, C9.SingSing): Will feed and then go watch streams for the rest of the day. -Dacheat
[TAG]Handle/TAG.Handle/TAG|Handle: Wants to look like they know what they're doing. Bonus points if it's a stack with matching tags. Bonus bonus points if you stomp them. The more in the stack the more bonus points. -Dacheat
Twitch Meme: Will try some obscure build that doesn't work and defend himself by saying "I saw Dendi do it". -Dacheat
Anime shit: Probably watching anime while playing. -Dacheat
These cross symbols "††": South American. Likely to chatter over voice chat in Spanish. -Dacheat
ру́сский язы́к: Some american pretending to be Russian. -Dacheat
ALL CAPS: Players with a high tendency to rage and sincerely believe from the bottom of their tiny hearts that they're good. Also, usually noob. -Humdinger
#RoadToX: Feed feed feed and blame team. -DeL
twitch.tv/x: Go watch stream to find wards and deward them. -DeL
VOLVO GIVE GOOD TEAM/My team is shit/MMR SUCKS: Have 0 impact all game. Not necessarily feed, just no impact. -DeL
Standin.x.HyperX/Standin.x.INT/Standin.x: doesnt speak english and probably will feed -TOUKO
Sampson: god -Sampson
These are some of the ones I've noticed. Feel free to add more.