Hello!

I listed some of the Features that opens at certain levels before but it isn't complete since I got busy with some things. Anyway, here is the list that I managed to compile. If other players know or have additional info about this topic, feel free to add it here. Thank you.

Level 3 - Ninja Interface

Level 5 - Benefit Hall

Level 7 - Talens Interface/Power-Up Unlocks(Strengthen,Upgrade,Magatama)

Level 8 - Power-Up Icon

Level 11 - Recruit Interface(Bond Treasure, Seal Treasure)/Groceries Storage Room Interface

Level 12 - Test Ninjas Level 13 - Lucky Runes

Level 15 - Ninja Exam/Beset Magatama - Full Opening

Level 16 - Group Interface/Daily Practice

Level 17 - Groceries Storage Room - Shops Opens

Level 18 - Home Interface

Level 20 - Elite Instances

Level 21 - Arena

Level 22 - World Boss - Nine Tails Invasion

Level 23 - Rich Field

Level 24 - Progress Feature

Level 25 - Black Market Merchant

---Plot Instance Break (Reach Lv.26)

Level 26 - Ranked Battle(1 team)

Level 27 - Reputation Hall

---Plot Instance Break (Reach Lv.30)

Level 28 - Survival Trial/Ninja Cultivate

Level 29 - Ninja Collection Scrolls

Level 30 - Team Instances/Sage World Battlefield/Awaken Feature/Season System

Level 32 - Mood System

Level 39 - Strong Approaching

Level 40 - Refine Feature

Level 43 - Battle Armor

Level 44 - Clothing

Level 45 - Purify/Ranked Battles(2ndline)

Level 48 - Mysterious Cave

Level 50 - Summon Interface

Level 53 - Summon Hunting

Level 54 - Five Nature Chakra

Level 55 - Tactics

Level 56 - Ranked Battles(3rdline)/Treasury/Ninja Assist

Level 58 - Assist links

Level 60 - Tactics(PagesUpgrade)

Level 65 - Myoboku Cultivation

...

Hmm. As far as I remember, it unlocks at 55 but it wouldn't allow you to upgrade any of it but once you reached 60, you'll be able to upgrade and change tactics already. I might be wrong since it's been a long time already but that's what happened to the last character that I leveled up at that levels.