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> The modest type of variants is what I mostly do, like Castle Chess, 
> Arrangement Chess, and Pyrrhus Chess.

Personally I think really modest variants that only alter castling or
promotion are not very interesting. They look to much like Mad Queen. To be
interesting they must have at least one or more exotic pieces. And one
probably is too little, as it might get quickly traded, and leave you with
the same boring game allover. Pyrrhus Chess does not suffer from this that
much, as the exotic piece is very hard to capture. But this goes at the
price of the piece having very weird, non-chesslike properties (side
effects).

Between 'modest' and 'wild' I would define the concept of 'regular'
Chess variant, which has only pieces that capture by replacement and have
no side effects to their moves or presence, have a move pattern that does
not depend on their position on the board, is won by capturing /
checkmating a royal piece, has no drop moves.