A person who kills himself (R"L) as far as I know loses certain zechuyos (merits) in terms of their kavurah (burial) and other dinim (rules. See here for more). Is the same true if it was a katan (minor) that committed suicide?
The Shulchan Aruch (YD 345:3) writes:
so it seems we would treat it like any other regular case of death.