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Age 461 onward: after Piccolo’s rampage, Mutaito’s two surviving students found rival martial arts schools: the Crane School is dedicated to assassination, while the Turtle School is dedicated to...proper work/life balance and occasionally wearing a heavy shell. #HistoryofEver
Piccolo’s demon spawn are also supposed to have the nasty trait of preventing their victims from reaching the afterlife. Thankfully Piccolo Jr’s turned over a new leaf by the time he kills Goku, but everyone killed during Senior’s rampage 300 years ago is apparently screwed.
Still, in the series Piccolo Senior specifically makes Cymbal look like a dragon since his job will be DB-hunting, so maybe he just customizes all his children in the same manner, with Junior the only one he deems worthy to bear his visage.
Kill-Vearn’s title of “Reaper” is 死神/shinigami, literally “god of death” but also the Japanese term for the Grim Reaper. See also Death Note, Bleach, and frankly just about any other anime, really.
Finally, DBZ ep.137 recaps the original explanation from DB ep.125, with largely the same dialogue but brand-new animation:
This young lad’s name? We don’t know. His titles? Well, eventually he becomes known as 亀仙人/Kame-sennin, “Turtle Hermit”, and 武天老師/Muten Rōshi, roughly meaning the divine old martial arts master.
Merle’s name in katakana is メルル/Meruru and (per the Dai Perfect Book) is a play on the fact that she’s always teary-eyed (目がウルウル/me ga uru-uru). This aspect of her is really noticeable in the manga, but the anime gives her somewhat more conventional anime eyes.
The Dragonsbane sword is a recurring item in the DQ games that deals extra damage to dragons. Its Japanese name is ドラゴンキラー/Dragon Killer, so I assume it was the inspiration for WarGreymon’s Dramon Killer blades, which likewise are super effective against dragon Digimon.