no.
Both are WAY TOO kind to be like that.

hehe dont get fooled by their alter egos

Image result for is asriel good or bad undertale
Before his death, Asriel was a docile, unadventurous and loving child. ... After Alphys resurrects him without a SOUL as Flowey, Asriel becomes incapable of feeling love or empathy, which in turn causes him to become resentful, twisted, and evil.

yeah

susie said in the end of deltarune chapter 2 that they will find a way to bring Rasiel to there world
and ever since it seems like the events in undertale did not happen in deltarune, resembling a new universe, that must means that rasiel might get revied without a soul, then the monster war started (most likey the way undertale described it) then they get sealed off, then undertale happens, but with a twist

hehehe

secret exposed

hehehehe

hehe

say that again but replace "no" with another "yes"

yes thank you

K