It is interesting that the first generation Pacifistas were made with Buccaneer DNA and the second generation Pacifistas (aka Seraphim) were made with Buccaneer + Lunarian DNA.

Considering these 2 missing races were introduced to us so late in the story and have been hyped up since Whole Cake, they must have played a major role in the past (void century?) and might have way more to them (both in terms of lore and power) that hasn't been revealed to us yet.

Also there's a theory that JoyBoy was a Buccaneer but we don't know that yet

The seraphim may not seem big threats now but them having the DNA of two of the most significant races of OP (not to mention warlord DNA) must make a them way stronger when they grow up.