The red gate is one level up. It is able to send you through time and space in the that dimension which explains how Lucca got from the forest to her home.
GOOD observation! I never thought about how you start in the forest yet end up on, what I tentatively call Ashtear Island (seriously, wtf is up w/them having their own island & bridge? lol...hm, in 600AD there was no island there, which means that they probably live on a friggin VOLCANO! maybe that's where the name Ashtear originates?)...I think it's also important to note that the Red Gate is a one-shot gate. If we assume that it's for Lucca (regardless of who made it), it also only needs to move one person through time/space...perhaps these things, including the red color, all constitute a lesser degree of temporal power going into use.
Please. Please, use paragraphs.
ANOTHER good n00b observation? In the first two posts of a new thread? Amazing.
I don't know if we can call Angelus Errare a Gate, really...it's its own thing really. Very special circumstances behind it.
Is there even a gate leading to the Devourer of Time? I just remember that when you use the Time Egg there it instantly starts a battle and then you're in the DBT...Just like with Angelus Errare, I don't think that's a real Gate either...
As for the Green Go-To-Lavos, Go-Directly-To-Lavos, Do-Not-Pass-Go, Do-Not-Collect-$100 Gate...I more or less write it off as non-canon since it's New Game+ material...I don't think that stuff about it being interdimensional is true...you can use a Gate from the inside of Lavos & it's a regular Blue Gate that spits you out at the bucket...but I suppose if I wasn't just going to call it a Dream Team created Gate, I might say that it's created by the newly saved Entity to allow the team early access in order to create even more timelines in which the Entity is saved...I mean, we all know how close a shave it really was for everything after Cross, right? lol...perhaps the Green color reflects or represents the rejuvenation of power & energy to the Entity in the main timeline.