There's Isaac and Miria from Baccano, not sure how popular the anime is anymore.
If you're into Vocaloid, I always pictured Gumi to be on the short side, and he could go for either Kaito or Gakupo.
If you're good with crossplay, Edward and Alphonse Elric. Or Winry, whatever.
Talim and Sigfried from Soul Calibur
He'd be just over six feet tall, btw.
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COSPLAYS IN PROGRESS
Canterbury (Kuroshitsuji) - 30% - Kuro Gathering
Utatane Piko - default (Vocaloid) - 15% - Ohayocon
Boris (Alice in the Country of Hearts) - 3%
Jean (Shingeki no Kyojin) - 0%