I found some 3rd edition rules for tieflings from some non-human races! I'm fiddling with updating them to 5E.
Fey'ri - Elf subrace (Elf + Demon (Succubi/Incubi))
If using racial ASIs, +1 CHA.
Shapechanger - Like changelings, with the additional restrictions that you can only change into Humanoids and must remain approximately the same height and weight.
Language: Abyssal
Access to a feat that grants wings and a 40' fly speed when not wearing medium or heavy armor.
Tanarukk - Orc variant (Orc + Demon)
If using racial ASIs, +2 STR and +1 DEX
Darkvision
Menacing
Powerful build
Fire Resistance
Control Flames (cantrip)
1d6 STR bite
Langauges: Common, Orc, Abyssal
Access to a feat that grants spell resistance.
Maeluth - Dwarf subrace (Dwarf + Devil)
If using racial ASIs, +1 CHA.
Fiend Hammer - 1/day as a bonus action, choose fire or necrotic. a melee weapon you touch deals an extra 1d6 damage of the chosen type on a hit for 1 minute.
Language: Infernal
Wispling - Halfing subrace (Halfling + Demon)
If using racial ASIs, +1 CHA.
Darkvision
Stealth proficiency
Disguise Self 1/day (using CHA, may also cast using spell slots)
Language: Abyssal
