A
If you ask Mihoyo, https://www.youtube.com/watch?v=Jm6tEjL_A-8 .
More seriously.
You would have two factors to consider:
how comfortable the process is - characters that don't require you to get too close, get in a specific position or aim a lot should get a better score.
number of characters involved - the less the better. I guess EI skill could help a lot but having multiple characters required should award less points.
style points, the flashier the process is, the better.
An ideal option for an attack should therefore be easy to use, have a big enough AOE in order to reduce the risk of missing and enough range to avoid scaring the bird by getting too close. This means that ranged AOE attacks or attacks that come out in front of the player are preferred to AOE attacks that are centered around the character.
Character
Aloy? (*)
Notes
Albedo
yes
Albedo really doesn't have much to give. His best options is using his burst after getting close enough. You will probably miss some birds.
Aloy
Her main advantage is being able to get very close due to her passive. She is also technically a free character if you played when she was given out. That said, her skills lack the AOE you would want for the process to be as simple as it can get
Amber
no
Her only option is her burst, which would need quite accurate aiming. Better options exist even considering free-only characters.
Arataki Itto
yes
Skip, his best option is Ushi. You would miss most of the time and getting close enough also probably requires Aloy.
Barbara
yes
Skip, lacks any AOE options. Her burst probably would cure the pigeons instead.
Beidou
yes
The counter probably COULD be fast enough to get all the pigeons, but you need Aloy for positioning yourself in the middle.
Bennett
yes
Even if you manage to use his burst... it probably comes out too slowly. It also requires Aloy basically.
Chongyun
yes
See: Bennet.
Diluc
no
Dawn. Diluc's burst doesn't need much effort to charge, has decent range and area coverage. Also gets bonus style points.
Diona
no
Cats are known for catching birds, but where is the fun if you kill all the toys at the same time? If you really want to try, probably your best bet is trying to aim her burst in the middle of the group
Eula
yes
Her elemental skill probably is up to the job, the elemental burst may be too slow. But there are better options. Also, usual problem with range and requiring Aloy to be easy enough.
Fischl
yes
Skip. Maybe her burst can be used, but that is far from easy and efficient.
Ganyu
no
Contrary to what the ads wants you to believe, her charged shot can be aimed so that the AOE hits all the birds. That said, expect to miss often allowing some to escape.
Gorou
yes
He has to use his burst to even get some AOE effect and even then he would probably requires Aloy support too since the attack is centered on the character thus needing you to be in the middle of the pigeon group for max effect. Skip. There is a good chance Gorou Tails and Sayu Sonic would get mad if you hurt poor little birds anyway.
Hu Tao
yes
Has AOE, but compared to Diluc has the range disadvantage that like always can be offset by Aloy. Gains bonus style point for performing her Hilichurl dance in front of Timmie afterward.
Jean
yes
Burst seem the only option since trying to use the pull effect of her skill will probably end up with some fugitives. Usual Aloy problem.
Kaedehara Kazuha
yes
As usual, if you have Aloy both his skill and his burst are perfect. But you probably skipped his banner because "5* Sucrose", right?
Kaeya
yes
Why would you try to use a bridge to kill pigeons?
Kamisato Ayaka
no
If done right, her burst can probably be quite flashy and effective. But it will require practice.
Kamisato Ayato
yes
Similar to Ayaka, but she has the advantage of a frontal AOE burst compared to one centered on the player.That said, the Kamisato Art: Suiyuu range is probably big enough to avoid the usual Aloy requirement.
Keqing
no
If you manage to throw her sword, teleport in the air and plunge just right, you can get all the pigeons and a Rainbow V score... But would this really count as "efficient" and "easy"?
Klee
-
Fishes are found in the lake, not on the bridge. Open your map and teleport to Starfell.
Kujou Sara
no
The trick is to first use her skill, then purposelessly miss the pigeons so that the totem spawns in the middle of the group. If done correctly the effect is basically a 4* version of Ganyu snowflake arrow.
Lisa
yes
Burst required. And that means Aloy. Can get better if raining.
Mona
yes
Doesn't have many options but IF you manage to find a way to use the omen skill and then another character for the actual blow... I guess you get bonus EXP point for the completely unneeded overkill, courtesy of Chara.
Ningguang
yes
Probably not worth the effort when you have better options.
Noelle
yes
Getting close enough to use her burst followed by a giant sword swipe can be stylish I guess.
Qiqi
-
DON'T. Qiqi place is in your pot with a finch, not on a bridge.
Raiden Shogun
yes
Very flashy and stylish at the risk of missing some birds.
Razor
yes
Most of his skills are quite slow, you have better options.
Rosaria
yes
You could try to user her burst maybe? Not worth the effort anyway. As usual, requires Aloy.
Sangonomiya Kokomi
yes
Can manage but I would expect the process to feel quite clunky. That said, she would get bonus style points for her animations.
Sayu
no
I have seen some trying the bowling ball technique but it doesn't feel very accurate. When it works just right it gets bonus style.
Shenhe
yes
Can do, especially if paired with Aloy. Can also be pretty stylish if you like the character.
Sucrose
no
Another character with a large AOE skill and burst that hits a zone in front of the character (instead of around the character like for example Jean) so she has an advantage. Her skill is probably already enough for the task but her burst makes things even easier.
Tartaglia
yes
Can manage, with Aloy support making thing easier as usual. But you will always live with the weight of the knowledge that it could be ten times better if you could use the Foul Legacy version instead...
Thoma
yes
Better used to clean the feathers left afterward.
Traveler
no
Geo version burst can be good paired with Aloy, but the Anemo one oddly takes the place as best option after you learn to line up correctly. Just don't try to use Electro.
Xiangling
no
The pyronado isn't as good as you would expect as some birds will often manage to escape while the fire blade circles around you. CAN work if you time it right so that you run into the pigeons as the blade is rotating in front of you
Xiao
no
IF you manage to use his burst, jump high enough and land on the pigeons you can get every single one and be in Mask form at the same time for added style.
Xingqiu
yes
Skip, doesn't have any real option.
Xinyan
yes
Better than Xingqiu but still unreliable.
Yae Miko
yes
Even if you manage to deploy the towers, it would still depend on RNG god.
Yanfei
no
Burst seems only option, still not good enough compared to other characters.
Yoimiya
-
Even with her attack speed, not fast enough. A pity. IF she could manage to get every bird with just her normal attack... she would be the winner by far just for sheer style.
Yun Kin
yes
Same issue as most characters, her AOE is centered on the player and thus benefits from Aloy.
Venti
no
The advertisement does not lie. His burst is the best option for ease of use. It is also worth noticing that with https://youtu.be/WPNGn3ZhBCI?t=68 Venti burst can keep the pigeons unable to escape while not killing them, giving you more time to get a closer look at their useless attempt to fly away.
Zhongli
no
What does Morax say when he goes to the Mondstadt KFC branch? "I will have order"
So
Best Free option: Traveler (Anemo)
Best 4* options: Sucrose, Sara
Best 5* options: Venti, Ganyu, Diluc
I will leave you the final choice, but whatever option you take will only take you one step closer on the road to the Abyss. And your soul will forever be crushed by the pain of remorse the day you will get the alternate version of Pigeons Go AWOL and discover WHY Timmie is always alone watching pigeons... (**)
(*) note: this just means that Aloy is suggested, not required, so no need to point it out if you manage to avoid her. I am just trying to list who benefits from her and who doesn't.
(**) and if you have no heart and that does not bother you, perhaps realizing that the game must be tracking how much you bully Timmie (otherwise Teyvat Times could not have included any stat) may perhaps make you reconsider about the consequences of your actions should the devs really get playful...