With xterm (Kitty, WezTerm, Alacritty) you can have good mouse support, hence you can have tooltip-like popups (AFAICT eldoc or lsp-ui-doc do it), and likely even drag and drop (never used it).

I suspect that with sixel support, and kitty image protocol support, images could be shown, too. At least, Eat, the elisp-based terminal.emulator, manages to show sixel graphics inside Emacs.