Lucina - Super Smash Bros. Ultimate Walkthrough - Neoseeker

Lucina - Super Smash Bros. Ultimate Walkthrough - Neoseeker

Tomodachi Life, Inazuma Eleven GO, Bravely Default, japanese

Lucas - Super Smash Bros. Ultimate Walkthrough - Neoseeker

Toon Link - Super Smash Bros. Ultimate Walkthrough - Neoseeker

Robin - Super Smash Bros. Ultimate Walkthrough - Neoseeker

I was really(!) bored, so here it is: The Smash Bros. 4 roster as

Lucina, Super Smash Bros. Ultimate Characters

So! I just found a CLEAR reference to Undertale in Smash Ultimate

Bayonetta Player 2 Amiibo - Super Smash Bros. Series [Nintendo

Super Smash Bros. Ultimate: 10 Tips To Master Lucina

Lucina - Super Smash Bros. for Wii U / 3DS Guide - IGN

Smashing the Screen: Lucina by PortalMasterDan64 on DeviantArt

So! I just found a CLEAR reference to Undertale in Smash Ultimate