Upon reaching Level 20, we receive an additional character of the same type, to be stuck at Level 9. (Prevents access to Tier 3 weapons).
This character does not level, it does not progress. We gain normal RP from this character, and additional RP equal to the XP we would have earned divided by 50, so 2000XP is 40 RP.
These Legacy Characters would have access to Tier 1 Abilities and Squad Supports and all the weapons up to Level 5 for use, as well as Mk 2 armor.
Legacy Characters get Legacy inventory. The only thing that can pass between Legacy Inventory and Core Inventory is inserts, frags, boost ammo, and loot boxes. No abilities or armor kits can go between them, basically making Legacy more like a new character rather than something to throw hand-me-downs on.