Monolith Soft has a heap of Super Robot Taisen fanservice in Super Robot Taisen OG Saga: Endless Frontier Exceed. Remember the PlayStation 2 game Super Robot Taisen: Original Generations? Two of characters from that game are in Endless Frontier Exceed.
Axel Almar and Alchemie wandered into the cross dimension world without their memories.
Both characters are playable, but they share a single character slot. Think of them like the character teams in Namco X Capcom, one of Monolith Soft’s earlier games. Here’s an animated look at their moves.