Gaku Hoshikawa/Five Red- His birthday was wrecked by Toad-Alligator Gin, he was killed but was resurrected by a time reversal.
Ryu Tendo/Red Hawk- He celebrated his 26th birthday when Camera Jigen attack. Gai Yuuki was such a pain to ruin the mood too.
Tsurihime/Ninja White- All the boys were somewhat after her. Hee hee. 
Kotoha Hanaori/Shinken Yellow- Her soul got sucked during her birthday but she was eventually saved by the others