Mitl? You good? You seem honestly pretty restrained for this.
Is it possible we misjudged him, and he's actually perfectly competent?..
...Nah.
I love the vibes of Segmented Flower, but both it and Size-shifting Bat sound very easy to detect for a stealthy scout. I'll go for Crystal Gecko.
Plus, we can make Geico Gecko jokes with this one.
[X] CRYSTAL GECKO
Is it possible we misjudged him, and he's actually perfectly competent?..
...Nah.
A combat-capable, flying stealth-scout, that makes a lot of noise? That last part feels like a deal breaker...[] SIZE-SHIFTING BAT
A stealthy bat covered with fur that can change colour and texture to allow it to blend into any surface. The bat itself is able to use a combination of Growth and Vibrance to change size rapidly. It can shrink until it's smaller than your fingernail or swell until it's roughly the size of a skyscraper. This makes it a decent physical fighter for a stealth-based monster and Sound gives it some powerful ranged options. And its oversized ears will pick up every scrap of sound in the area and triangulate their position effortlessly.
However, it has extremely poor eyesight, may bump into things, and its constant squeaking is definitely going to grate on your teammates' nerves.
Amazing stealth, and a climber, but terrible combat capability. It can likely get to places it won't be bumped into, thanks to it's climbing, but it could die easily.[] CRYSTAL GECKO
A stealthy gecko about the size of a cat that can cling to any surface and walk up walls. Although it has enormous eyes, it actually navigates primarily by bouncing sound off its reflective, crystalline scales. Thanks to Vibrance, it can instinctively manipulate the light around it to conceal its presence, creating an illusion of the surface behind it as if were not even there. This makes it very good at clinging to ceilings and other out-of-the-way places. And thanks to Growth, its metabolism is very slow, allowing it to remain in place for quite a while.
However, it's not a good fighter, moves rather slowly, and if anyone steps on it or bumps into it, its cover will be blown.
A surveillance plant, able to a watch a bunch of Tokyo through it's vines and defend itself, but immobile and it's vines can be seen.[] SEGMENTED FLOWER
A stealthy flower that can track movement in its surroundings through Sound and use a combination of Growth and Vibrance to extend coiling vines toward a given target. Although the actual plant is rather small, easily fitting inside a standard desktop flower pot, it can extend its vines across a sizeable chunk of the Tokyo area given enough time. And once it has vines in place, it can hear through blossoms on them, potentially allowing you to monitor several areas at once. And its vines could be used for an impromptu weapon if it comes under attack.
However, it's an immobile plant, and it lacks any means of concealing its vines beyond them being naturally small and, well, plant-like. If anyone is learned enough in local plants, they will know it's an unnatural growth. Or worse, try stamping it out as an invasive species.
I love the vibes of Segmented Flower, but both it and Size-shifting Bat sound very easy to detect for a stealthy scout. I'll go for Crystal Gecko.
Plus, we can make Geico Gecko jokes with this one.

[X] CRYSTAL GECKO