diff --git a/extractor/src/main/java/org/schabi/newpipe/extractor/channel/ChannelExtractor.java b/extractor/src/main/java/org/schabi/newpipe/extractor/channel/ChannelExtractor.java
index db0333647..d5587ec4e 100644
--- a/extractor/src/main/java/org/schabi/newpipe/extractor/channel/ChannelExtractor.java
+++ b/extractor/src/main/java/org/schabi/newpipe/extractor/channel/ChannelExtractor.java
@@ -1,6 +1,27 @@
+/*
+ * Created by Christian Schabesberger on 25.07.16.
+ *
+ * Copyright (C) Christian Schabesberger 2016 <chris.schabesberger@mailbox.org>
+ * ChannelExtractor.java is part of NewPipe Extractor.
+ *
+ * NewPipe Extractor is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * NewPipe Extractor is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with NewPipe Extractor.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package org.schabi.newpipe.extractor.channel;
 
 import org.schabi.newpipe.extractor.Extractor;
+import org.schabi.newpipe.extractor.Image;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.exceptions.ParsingException;
 import org.schabi.newpipe.extractor.linkhandler.ListLinkHandler;
@@ -8,26 +29,6 @@ import org.schabi.newpipe.extractor.linkhandler.ListLinkHandler;
 import javax.annotation.Nonnull;
 import java.util.List;
 
-/*
- * Created by Christian Schabesberger on 25.07.16.
- *
- * Copyright (C) Christian Schabesberger 2016 <chris.schabesberger@mailbox.org>
- * ChannelExtractor.java is part of NewPipe.
- *
- * NewPipe is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * NewPipe is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with NewPipe.  If not, see <http://www.gnu.org/licenses/>.
- */
-
 public abstract class ChannelExtractor extends Extractor {
 
     public static final long UNKNOWN_SUBSCRIBER_COUNT = -1;
@@ -36,14 +37,17 @@ public abstract class ChannelExtractor extends Extractor {
         super(service, linkHandler);
     }
 
-    public abstract String getAvatarUrl() throws ParsingException;
-    public abstract String getBannerUrl() throws ParsingException;
+    @Nonnull
+    public abstract List<Image> getAvatars() throws ParsingException;
+    @Nonnull
+    public abstract List<Image> getBanners() throws ParsingException;
     public abstract String getFeedUrl() throws ParsingException;
     public abstract long getSubscriberCount() throws ParsingException;
     public abstract String getDescription() throws ParsingException;
     public abstract String getParentChannelName() throws ParsingException;
     public abstract String getParentChannelUrl() throws ParsingException;
-    public abstract String getParentChannelAvatarUrl() throws ParsingException;
+    @Nonnull
+    public abstract List<Image> getParentChannelAvatars() throws ParsingException;
     public abstract boolean isVerified() throws ParsingException;
     @Nonnull
     public abstract List<ListLinkHandler> getTabs() throws ParsingException;
diff --git a/extractor/src/main/java/org/schabi/newpipe/extractor/playlist/PlaylistExtractor.java b/extractor/src/main/java/org/schabi/newpipe/extractor/playlist/PlaylistExtractor.java
index bc4eee467..a714deadb 100644
--- a/extractor/src/main/java/org/schabi/newpipe/extractor/playlist/PlaylistExtractor.java
+++ b/extractor/src/main/java/org/schabi/newpipe/extractor/playlist/PlaylistExtractor.java
@@ -1,5 +1,6 @@
 package org.schabi.newpipe.extractor.playlist;
 
+import org.schabi.newpipe.extractor.Image;
 import org.schabi.newpipe.extractor.ListExtractor;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.exceptions.ParsingException;
@@ -9,6 +10,9 @@ import org.schabi.newpipe.extractor.stream.StreamInfoItem;
 
 import javax.annotation.Nonnull;
 
+import java.util.Collections;
+import java.util.List;
+
 public abstract class PlaylistExtractor extends ListExtractor<StreamInfoItem> {
 
     public PlaylistExtractor(final StreamingService service, final ListLinkHandler linkHandler) {
@@ -17,7 +21,8 @@ public abstract class PlaylistExtractor extends ListExtractor<StreamInfoItem> {
 
     public abstract String getUploaderUrl() throws ParsingException;
     public abstract String getUploaderName() throws ParsingException;
-    public abstract String getUploaderAvatarUrl() throws ParsingException;
+    @Nonnull
+    public abstract List<Image> getUploaderAvatars() throws ParsingException;
     public abstract boolean isUploaderVerified() throws ParsingException;
 
     public abstract long getStreamCount() throws ParsingException;
@@ -26,15 +31,13 @@ public abstract class PlaylistExtractor extends ListExtractor<StreamInfoItem> {
     public abstract Description getDescription() throws ParsingException;
 
     @Nonnull
-    public String getThumbnailUrl() throws ParsingException {
-        return "";
+    public List<Image> getThumbnails() throws ParsingException {
+        return Collections.emptyList();
     }
 
     @Nonnull
-    public String getBannerUrl() throws ParsingException {
-        // Banner can't be handled by frontend right now.
-        // Whoever is willing to implement this should also implement it in the frontend.
-        return "";
+    public List<Image> getBanners() throws ParsingException {
+        return List.of();
     }
 
     @Nonnull
@@ -48,8 +51,8 @@ public abstract class PlaylistExtractor extends ListExtractor<StreamInfoItem> {
     }
 
     @Nonnull
-    public String getSubChannelAvatarUrl() throws ParsingException {
-        return "";
+    public List<Image> getSubChannelAvatars() throws ParsingException {
+        return List.of();
     }
 
     public PlaylistInfo.PlaylistType getPlaylistType() throws ParsingException {
diff --git a/extractor/src/main/java/org/schabi/newpipe/extractor/stream/StreamExtractor.java b/extractor/src/main/java/org/schabi/newpipe/extractor/stream/StreamExtractor.java
index 6fbcf8fbb..f974cade0 100644
--- a/extractor/src/main/java/org/schabi/newpipe/extractor/stream/StreamExtractor.java
+++ b/extractor/src/main/java/org/schabi/newpipe/extractor/stream/StreamExtractor.java
@@ -1,25 +1,26 @@
-package org.schabi.newpipe.extractor.stream;
-
 /*
  * Created by Christian Schabesberger on 10.08.18.
  *
  * Copyright (C) Christian Schabesberger 2016 <chris.schabesberger@mailbox.org>
- * StreamExtractor.java is part of NewPipe.
+ * StreamExtractor.java is part of NewPipe Extractor.
  *
- * NewPipe is free software: you can redistribute it and/or modify
+ * NewPipe Extractor is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
  *
- * NewPipe is distributed in the hope that it will be useful,
+ * NewPipe Extractor is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
- * along with NewPipe.  If not, see <http://www.gnu.org/licenses/>.
+ * along with NewPipe Extractor.  If not, see <https://www.gnu.org/licenses/>.
  */
 
+package org.schabi.newpipe.extractor.stream;
+
+import org.schabi.newpipe.extractor.Image;
 import org.schabi.newpipe.extractor.InfoItem;
 import org.schabi.newpipe.extractor.InfoItemsCollector;
 import org.schabi.newpipe.extractor.InfoItemExtractor;
@@ -87,13 +88,12 @@ public abstract class StreamExtractor extends Extractor {
     }
 
     /**
-     * This will return the url to the thumbnail of the stream. Try to return the medium resolution
-     * here.
+     * This will return the thumbnails of the stream.
      *
-     * @return The url of the thumbnail.
+     * @return the thumbnails of the stream
      */
     @Nonnull
-    public abstract String getThumbnailUrl() throws ParsingException;
+    public abstract List<Image> getThumbnails() throws ParsingException;
 
     /**
      * This is the stream description.
@@ -208,14 +208,18 @@ public abstract class StreamExtractor extends Extractor {
     }
 
     /**
-     * The url to the image file/profile picture/avatar of the creator/uploader of the stream.
-     * If the url is not available you can return an empty String.
+     * The image files/profile pictures/avatars of the creator/uploader of the stream.
      *
-     * @return The url of the image file of the uploader or an empty String
+     * <p>
+     * If they are not available in the stream on specific cases, you must return an empty list for
+     * these ones, like it is made by default.
+     * </p>
+     *
+     * @return the avatars of the sub-channel of the stream or an empty list (default)
      */
     @Nonnull
-    public String getUploaderAvatarUrl() throws ParsingException {
-        return "";
+    public List<Image> getUploaderAvatars() throws ParsingException {
+        return List.of();
     }
 
     /**
@@ -243,14 +247,23 @@ public abstract class StreamExtractor extends Extractor {
     }
 
     /**
-     * The url to the image file/profile picture/avatar of the sub-channel of the stream.
-     * If the url is not available you can return an empty String.
+     * The avatars of the sub-channel of the stream.
      *
-     * @return The url of the image file of the sub-channel or an empty String
+     * <p>
+     * If they are not available in the stream on specific cases, you must return an empty list for
+     * these ones, like it is made by default.
+     * </p>
+     *
+     * <p>
+     * If the concept of sub-channels doesn't apply to the stream's service, keep the default
+     * implementation.
+     * </p>
+     *
+     * @return the avatars of the sub-channel of the stream or an empty list (default)
      */
     @Nonnull
-    public String getSubChannelAvatarUrl() throws ParsingException {
-        return "";
+    public List<Image> getSubChannelAvatars() throws ParsingException {
+        return List.of();
     }
 
     /**