here is Noesis python script to open your samples. supports 360 tiled dxt1, dxt5, and ati2, top level mip only.

which platform did your samples come from?
google says this game was released on GameCube,
Game Boy Advance, PlayStation 2, Microsoft Windows and Xbox.
looks like there might be a color palette at the end of the file.
do you have more samples to compare against?

here is a quick Noesis python script based on the small sample size. supports big endian dxt1 and dxt5, top level mip only.
open the *.data file and the script will find the extensionless header file if
they are next to each other.

artifacts are shown in texture finder because X360 images are big endian.

here is Noesis python script to open stx textures. supports dxt1, dxt5 and morton swizzled rgba8888

well i can't do a thing without some not working samples for examination.

3 out of 4 of your samples is corrupt, but this Noesis python script works with avatar.png.ckd
https://zenhax.com/viewtopic.php?f=7&t=8519#p43370

that file is zlib compressed instead of lzma, and it is headerless rgba32 when decompressed,
i will try to modify the script later to accomodate these best i can.
i might just put this into a Noesis python script later for fun.

edit: script updated in previous post

Is there a way to preserve the transparency when importing into Noesis, though? The transparency has been replaced with a black background. i'm pretty sure any image meant to have transparency in this game is accompanied by a file of the same name also with _a in the file name to denote "alpha" and...

here is Noesis python script to open pic files from this game.

Hey Acewell, I have been trying to contact you for a while, I would like you to help me please, I really need you. Is that possible ? if you need help with something you should create a new thread and provide the full game name, platform and several samples to examine then maybe myself or someone e...

texconv is a command-line tool, you must run it from command prompt.

you can use texconv to convert to R11G11B10_FLOAT
https://github.com/Microsoft/DirectXTex/wiki/Texconv

i don't think these pic samples are apple formats, just typical paletted/non-paletted rgb images with pic extension.

they are lzma compressed, here is bms script to decompress to viewable dds files.

edit
*updated script to support zlib compressed files also*