I don't like to write this type of review, but I have no patience with writing this. Kymani Jones is one of the most powerful investigator in AHLCG.
Statline is good: 5 for means they could do many things via rouge card effects like Backstab, Pilfer, Lockpicks. Unlike other rouges, they have 3 ; it means that they have good encounter resistance. One problem is that with no cards, nothing can do due to 2 & 2; they is not recommand to the beginner.
Ability is powerful: Someone may think Waylay. Here is huge difference, however. Waylay requires 2 action & 3 resources. Kymani's ability requires 2 action only. Moveover, Stealth (3) makes this ability 1 action-only discard ability.
The common support card make Kymani very powerful: Stealth (3) + 2 Pickpocketing + Lucky Cigarette Case. You can discard most of the enemy only with one action earning 3 cards (and 2 resources with high level pickpocketing). Moreover, you may perform 2 times if you setup two Stealth. In general (for normal difficulty), first evade may have some trouble (if, commit or boost), but Stealth test don't have trouble since -2 difficulty and +2 skill value.
Someone may think that discarding the enemy is the penalty since Victory enemy doesn't go into victory area. However, if you prepare some other fight method such as Backstab, it does not matter. Instead, discarding enemy detours Vengeance and Swarming enemy. Very powerful in some campaign. (If you discard Vengeance enemy, they do not go into Victory area, so that they do not contribute to the Vengeance points. You can discard host of swarming enemy even if there exists any swarm enemy, and all other swarm enemies goes out of play.)
Signature weakness is under average: For basic evade action, 5 vs 3 means that -2 token is successful. In standard difficulty, it's not hard work. Of course, discarding with their ability may be hard. You just fine to evade sometime and move to other location. Otherwise, here is Backstab. 5 vs 2 is usually successful.
Tool deckbuilding is not good, but enough: I think that there are few or none of non- tool cards, currently (since spoiler season, not all Scarlet Keys cards are considered). However, 0-5 is enough. They can access all key cards unlike Finn; Stealth, Pickpocketing, Double, Double, Well Connected, Hot Streak...
Starting xp is really cool: The main problem of class (and ) is starting deck is especially worse comparing other classes with high potential. Starting 5XP perfectly solves this problems. You may start with Stealth (3) for single action enemy discard + Charon's Obol. You may start with In the Thick of It + Double, Double.