My favorite openings from anime series I've watched this 2020 excluding seasonals:
Starting with absolutely the best opening I've seen this year
SKET Dance OP 4
"Message" by The Sketchbook
Starting with absolutely the best opening I've seen this year
SKET Dance OP 4
"Message" by The Sketchbook
AHHHH THIS IS SO BEAUTIFUL!! 
Natsume Yuujinchou S3 OP
"Boku ni Dekiru Koto" by HOW MERRY MARRY

Natsume Yuujinchou S3 OP
"Boku ni Dekiru Koto" by HOW MERRY MARRY
Watch Tengen Toppa Gurren Lagann
Became one of my top favorite anime ever and this opening is a bop!
"Sorairo Days" by Shoko Nakagawa
Became one of my top favorite anime ever and this opening is a bop!
"Sorairo Days" by Shoko Nakagawa
Watch Ping Pong the Animation
Banger opening from one of the best sports series
"Tada Hitori" by Bakudan Johnny
Banger opening from one of the best sports series

"Tada Hitori" by Bakudan Johnny
Another beautiful opening from this anime 
Natsume Yuujinchou S2 OP
"Ano hi Time Machine" by LONG SHOT PARTY

Natsume Yuujinchou S2 OP
"Ano hi Time Machine" by LONG SHOT PARTY
Watch Chihayafuru
Currently loving this anime
OP1: "YOUTHFUL" by 99RadioService
Currently loving this anime

OP1: "YOUTHFUL" by 99RadioService
Watch SKET Dance 
I feel Gintama OP 9 in this opening for some reasons
OP 5: "Reboot" by everset

I feel Gintama OP 9 in this opening for some reasons
OP 5: "Reboot" by everset
Watch Fate/Zero and stan queen LiSA
S1 OP1: oath sign" by LiSA
S1 OP1: oath sign" by LiSA
Watch Fate/stay night: UBW and stan one of my favorite Japanese singers
S2 OP2: "Brave Shine" by Aimer
S2 OP2: "Brave Shine" by Aimer
Watch Bungou Stray Dogs
S2 OP: Reason Living" by SCREEN mode
S2 OP: Reason Living" by SCREEN mode