Remy can utilize kara-cancels to his advantage moreso than the rest of the cast.
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He has 2 karas (mp, far hk) which both have no directional requirements so he isn’t bound by a single directional kara throwing game (Q or akuma).
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Remy can also make use his crouching mp kara to add distance to his razorkick, which makes certain combos possible (cr.fierce, cbk, kara-razorkick), and makes his anti air range much more deceptive. It should also be noted that he can also combo a kara-razorkick in the corner after a neutral grab on characters that he normally could not with a regular razorkick.
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Kara-roundhouse CBK gives him another option to escape from the corner. You can also space yourself differently with kara short or mk cbks.
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The fact that Remy has a punch and kick kara means that he can kara both his supers. Kara supers are very powerful. You can kara saII to punish things from further away, like a shoto cr.mk. Kara saI can be hit-confirmed off a cl. hk (works on standing) or cl.mk if they are hit crouching. It can also be used to punish things that are normally safe on Remy, like an Alex EX elbow rush.
I should use karas more!