Mindscapes
As we see in TFP's "Sick Mind," cybertronians' mindscapes can take on many different forms (Megatron's had him constantly combating Autobots without end on a derelict Cybertron until Bumblebee's presence made him self-aware)
So here's my idea of some other bots' mindscapes (at least in my AU and in the context of someone invading their mind for intel)
Chase's is a seemingly endless corridor of bookshelves, every shelf filled to the brim with books and only he knows where in all of these shelves and books is the information someone might want. Most books have police code, laws from all across the galaxies, and the like, but his personal information is hidden within the books and they look the same as all the others from the outside.
Blades' is filled with screens. TV shows, replays of conversations he's had with others, scrolling information on repeat- and it is all at full blast. Anyone who might enter his mindscape would be bombarded with sound and bright light from the screens, and they're everywhere, keeping what's important well hidden.
Boulder's is a massive garden/greenhouse/indoor forest. There are plants, animals, and sculptures all over, with winding paths between them that seem to lead to nowhere. Any important info has been placed in secret compartments of statues, tied to the legs of animals, or buried in the roots of plants- but not all of them, and some is hidden in cryptic notes written on diagrams of inventions and buildings that are plastered to the walls. He holds the key to the many locked doors that only lead deeper into the greenhouse.
Heatwave's is an almost exact replica of Griffin Rock (formerly it was Cybertron). He's formulated his mindscape specifically for ease of access for him, but lack of ease for any invaders. Important information is carried by civilians, but its like encountering an NPC, you have to know the right things to ask to get that information. He also has his own defensive walls that manifest as the island's rogue tech, and finding him specifically in the mindscape is hard, as he has made the tunnels under the island his personal way of traveling, and their true entrances don't match that of the real tunnels in the physical world.
Bumblebee's is a nebulous mixture of Cybertron and various locations on Earth. Entering Unit:E's hangar will actually transport you to a small bar nestled in the corners of Iacon, and then going back through that door will spit you out in the middle of the Arctic, and then again onto the halls of the Decepticon ship Nemesis. Bumblebee can be anywhere, doing anything, and there's multiple versions of him, so you can never really know which one is the true Bumblebee just chilling in his own memories.
