Not just how it physically looks but, y'know, the vibes.
Athlon XP for me, easy.
It is my favorite processor, because it has a really easy to learn instruction set, but also lots of power behind it. It was designed with the C programming language in mind! And it was used in so many influential systems, such as the Macintosh, the Amiga, the Atari ST, the X68000... it was also used in game consoles like the Sega Mega Drive and the Neo Geo, as well as the ol' Palm PDAs. It is my comfort CPU

👍