If you liked
Ore no Kanojo to Osananajimi ga Shuraba Sugiru
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...then you might like
Nisekoi
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Main guy and main girl pretend to be a couple due to strange circumstances, but things don't go as smoothly as planned because there's a lot of other girls in the harem who want the MC.
If you liked
Boku wa Tomodachi ga Sukunai
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...then you might like
Yahari Ore no Seishun Love Comedy wa Machigatteiru.
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A bunch of social outcasts and misfits join a club and learn to make connections with other human beings, with plenty of romcom hijinks along the way.
If you liked
Great Teacher Onizuka
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...then you might like
Ansatsu Kyoushitsu
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Unorthodox teacher helps his class of misfit students navigate the perils of the Japanese school system and teenage life.
If you liked
Last Exile
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...then you might like
Ao no 6-gou
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Sci fi series centered around a big ship and its crew, while the male and female leads in both shows specialize in in piloting a smaller "fighter" craft. Last Exile takes place in the sky while Blue Sub 6 takes place in the sea. Both shows were made by Gonzo and heavily feature very early and rudimentary 3D CGI.
If you liked
Kinnikuman II Sei
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...then you might like
Hataage! Kemono Michi
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Weird comedic action series based around pro wrestling.
If you liked
IS: Infinite Stratos
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...then you might like
Masou Gakuen HxH
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MC is the lone male student at an all girls academy that trains mech pilots who wear revealing armor.
If you liked
Air Gear
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...then you might like
IGPX: Immortal Grand Prix (2005)
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Mid 00's racing anime with a futuristic bent and rebellious protagonist.
If you liked
Full Metal Panic!
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...then you might like
Kidou Senshi Gundam 00
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Mecha series both of which have a straight laced, no-nonsense Middle Eastern main character who used to be a child soldier and joins a secretive organization that fights for World peace.
If you liked
School Rumble
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...then you might like
Kaguya-sama wa Kokurasetai: Tensai-tachi no Renai Zunousen
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The author of Kaguya-sama cited School Rumble as his inspiration to write Kaguya-sama. Both are funny romcoms with wacky characters failing in hilarious ways to attract their crush.