Namco X Capcom/Characters

Reiji and Xiaomu
Tropes shared by both:
 * Badass Creed: Recited during the Shinra Bansho, which reference the elements that they wield.
 * Boke and Tsukkomi Routine: Xiaomu starts it, Reiji usually finishes it.
 * Bottomless Magazines: Though they do reference having to reload and change out ammo, so they apparently do have limited ammo, we just don't see the reloading.
 * Casual Kink: Spanking. Reiji dishing it out, Xiaomu on the receiving end.
 * Combination Attack/Limit Break: Shinra Banshou.
 * Deuteragonist: Each plays one half of this role.
 * Dual Wielding: They are depicted doing so in games after Namco X Capcom.
 * Elemental Powers: They utilize all but wind elemental attacks.
 * Expy: According to the creators, of Kyosuke Nanbu and Excellen Browning.
 * Guns Akimbo: Reiji has a .44 magnum revolver and a lever-action shotgun, while Xiaomu wields dual pistols
 * Gun Kata: Displayed prominently during their Multiple Assault attack in Namco X Capcom.
 * Leitmotif: "Yuragi no Machi no Arisu" in Endless Frontier. It literally is rendered as "The Trembling City of Arisu", but is transliterated as "Alice in Fluxland".
 * May-December Romance: Implied for Reiji and Xiamou at points in Namco X Capcom,.
 * The Musketeer: Both Reiji and Xiaomu use a mix of guns and melee weapons.
 * Odd Couple: Reiji is deadpan and kinda moody, yet it's a front for how much he cares about people. Xiaomu is spastic and childish, and yet even more a protective softy than Reiji underneath.
 * Original Generation: Based off two other Original Generation characters at that.
 * Rule of Symbolism: Their creed when unleashing Shinra Banshou, which references various elements of nature.
 * Savvy Guy, Energetic Girl: They adhere to this trope to a T.
 * Shotguns Are Just Better: Reiji's "Gold", a sawed off, lever action double barrel.
 * Uptight Loves Wild: It's quite obvious they are pretty close despite their differing natures.
 * Walking Armory: Reiji wields two katanas, a shotgun and a revolver while Xiaomu brandishes a Sword Cane and goes Guns Akimbo.
 * Walking Armory: Reiji wields two katanas, a shotgun and a revolver while Xiaomu brandishes a Sword Cane and goes Guns Akimbo.