Regarding the kanji character for "Ryo," the old-style character is also commonly used for Ryoma partly because Ryotaro SHIBA used the old style in his novel "Ryoma ga Yuku" and the old-style character was selected as a "Kanji Designated for Everyday Use" although Ryoma himself never used the old-style character.
なお、「竜」は「龍」の異体字（「竜」は「龍」の古体字）で、龍馬自身は「竜」の字体を使ったことがないが、司馬遼太郎の「竜馬がゆく」で使われたことや、「竜」が常用漢字に採用されたこともあり、慣用化されている。