Perfect Openings

• YuYu Hakusho - Hohoemi no Bakudan or SMILE BOMB my personal GOAT.

• G Gundam - FLYING IN THE SKY

• G Gundam - TRUST YOU FOREVER

• Naruto - Yura Yura by Hearts Grow If I had to choose one.

• Naruto Shippuden - Toumei datta Sekai by Hata Motohiro

• Nagi No Asukara - Ebb and Flow by Ray

• Sword Art Online - Crossing Field by LiSA hate the show all you want you can't deny this is a 10/10 opening

• Kill la Kill - Sirius by Eir Aoi

• Bleach - D-tecnolife by UVERworld

Good Stuff

• Saint Seiya The Lost Canvas - The Realm of Athena by EUROX

• Saint Seiya Omega - Pegasus Fantasy (Version Omega) by Make-Up

• R.O.D. the TV super underrated imo

• Tower of God - TOP by Stray Kids I'm just used to the JPN version.

• Gundam Wing - Just Communication by Two-Mix

• Noragami - Kyōran Hey Kids by The Oral Cigarettes

• Mushishi - Shiver by Lucy Rose

• Nisemonogatari - Platinum Disco performed by Yuka Iguchi because everyone already knows Renai Circulation

• Arpeggio of Blue Steel - Savior of Song by nano ナノ

• Shuffle! - YOU by Yuria

• .hack//SIGN - Obsession by SEE-SAW

• .hack//Legend of the Twilight - NEW WORLD by Round Table feat. Nino

• Highschool of the Dead by Kisida Kyodan & the Akebosi Rockets

• Ikki Tousen - Drivin Through the Night by m.o.v.e slightly NSFW

• Queens Blade Rebellion - Inochi no Uta ga Kikoeru by Tamura Naomi apparently YouTube hates this opening lol

Really making me wrack my brain here, but that's what I got for now, tried to pick a few that a lot of folks probably wouldn't be all too familiar with. Of course there's plenty more I like that have already been mentioned here like Sorairo Days and the like.