I run 3 school groups (7-10 year olds). All players choose a race from the PHB by browsing. None really know about feats and they only slightly acknowledge racial features like dragon breath, so choices tend to be based on perceived coolness and the pictures. Note the dragonborn outbreak!
Group 1 (All boys): var. human shadow monk, var. human wild sorcerer, dragonborn conjurer, dragonborn moon druid, var. human transmuter
Group 2 (All girls): rock gnome necromancer (pirate!), wood elf ranger, forest gnome elemental monk, half-elf moon druid, half-elf transmuter, dragonborn conjurer.
Group 3 (mixed gender): Boys: half-orc moon druid, half-orc light cleric, half-orc warlock, dragonborn warlock. Girls: hill dwarf arcane trickster, dragonborn moon druid.
The half-orc heavy group has made frequent use of their "not quite dead" feature as they tend to "almost die" a lot. The savage attack feature has never even surfaced! What is really funny is they are still coming to grips with how naturally intimidating their group is. Luckily the cleric has some diplomatic tendencies.