Born sickly to negligent parents (if they could be called that) Seafoam was living on borrowed time.
Literally.
He was (unknown to him) saved repeatedly by Wave, who had made a deal with a powerful person to change her brother's fate... Unawares that this person was actually forcing Pyre to change Seafoam's Fortune.
Seafoam lived his life to it's fullest, subconsciously aware of his limited time. When he was offered a chance to be a Magical Boy he pounced on it, ready for an adventure. He was the first of his siblings to gain this power and learned the difficult way that it was actually more of a nightmare. Despite this, he tackled the situation head on and with no regrets.
It was in a fight with an Ancient One who had been magically Bound by a greedy crime lord that he had died by pushing Ripple out of the way of a lethally powerful attack from that selfsame Ancient One.
He never felt it.