~His name is just "Macintosh", a nod to his father's name (Bright Macintosh/Mac). The "little" and "big" prefixes to his name as he grew up was like a nickname, and it stuck with him.
~His mark symbolizes that on the outside he may seem intimidating and tough (hence the coloration of the apple, which implies a "sour" flavor), but on the inside he's a big lovable goof with a sweet side (the inside of the apple represents a sweet flavor, and the seeds represent his close family ties)
~He doesn't usually speak a lot, thanks to not thinking he actually needs to. This winds up with him saying simply "eeyup" or "eenope" as an answer most often, which he and others thinks is fine. Though with this he also keeps feelings pent up, and it's hard for him to speak up about them, especially to those he's close to. He has learned to feel better about speaking though, and speaks more often (mostly around loved ones)- though is still quite soft spoken.
~He is married to Rarity and has two kids
~He no longer directly works on the farm, much like Apple Bloom, but tends to come around for the annual planting and harvest.