This list actually turned out to be pretty strong.
Rankings are based on music
Enjoy!
List of Themes Used:
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Angolmois: Genkou Kassenki OP 1: "Braver" by Straightener
Baki OP 1: "BEASTFUL" by GRANRODEO
Banana Fish OP 1: "found & lost" by Survive Said The Prophet
Black Clover OP 4: "Guess Who Is Back" by Kumi Koda
Boku no Hero Academia 3rd Season OP 2: "Make my story" by Lenny code fiction
Chuukan Kanriroku Tonegawa OP 1: "Sassou to Hashiru Tonegawa-kun" by Gesu no Kiwami Otome.
Free!: Dive to the Future OP 1: "Heading to Over" by OLDCODEX
Gintama.: Shirogane no Tamashii-hen 2 OP 1: "I Wanna Be..." by SPYAIR
Gundam Build Divers OP 2: "Infinity" by SWANKY DANK
Isekai Maou to Shoukan Shoujo no Dorei Majutsu OP 1: "DeCIDE" by SUMMONERS 2+
Kakuriyo no Yadomeshi OP 2: "Utsushiyo no Yume" by nano
Lord of Vermilion: Guren no Ou OP 1: "Tenshi yo Kogou wo Kike" by May'n
Major 2nd OP 2: "Dream Catcher" by Berry Goodman
Nobunaga no Shinobi: Anegawa Ishiyama-hen OP 2: "Tsuisou no Ri" by VALSHE
Phantom in the Twilight OP 1: "Flowery song" by Jiro Wang
Shingeki no Kyojin Season 3 OP 1: "Red Swan" by YOSHIKI feat.HYDE
Shichisei no Subaru OP 1: "360° Hoshi no Orchestra" by petit milady
Tenrou: Sirius the Jaeger OP 1: "Sirius" by Kishida Kyoudan &THE Akeboshi Rockets
Tsukumogami Kashimasu OP 1: "Get Into My Heart" by MIYAVI vs Kavka Shishido
Zoids Wild OP 1: "Starting Over" by DISH//
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I have only used previews of all songs, abiding by the fair use act. If anything, this acts as a promotion for all the artists involved.